Eunorau Specter-S 4.0 Review Canada (2026): Range, Fit and Law

Zeus with the Specter-S 4.0 on a ranch two-track in the Alberta foothills: a Playcut.ai rendering made from Eunorau's own photograph of the bike, so an illustration of it. The product photographs below are Eunorau's, unaltered apart from crops. The 83 km is the range section's figure for 20 km/h on the throttle with an 80 kg rider on level pavement.

Eunorau published the Specter-S 4.0, also titled the Hunter X9, on its Canadian store on 23 September 2026 at $5,099, and Zeus lists it at $5,099. It replaces the 2024 Specter-S in Eunorau Canada's catalogue, and every YouTube review our three searches returned on 13 October predates the 4.0. This review is of the 4.0 alone: every specification is Eunorau Canada's, read on 13 and 16 October 2026, every store term is Zeus's, read on 16 October 2026, and every range and fit figure is computed from those published numbers and printed with its conditions.

Who the Specter-S 4.0 is for

Eunorau put a new Specter on its Canadian store on 23 September, and the YouTube reviews our searches turned up are of the bikes before it. A 38 kg, 1,000 W machine bought for the wrong frame or the wrong ground is $5,099 of bike you cannot use as intended.

This review computes its range at your speed, load and temperature, checks both frames against your inseam, and reads each province's rule.

Eunorau files the Specter-S 4.0 under Hunting and Fishing, and its own headline for the bike reads "Power the Climb. Control the Descent." Read the specification that way: a 1,000 W mid-drive that runs through eleven gears, 140 mm of fork travel and 50 mm of rear suspension travel, 26 × 4.0 tires, and a rack and full fenders for whatever you carry in. It is a machine for private land, farm tracks and trails whose rules allow a 1,000 W bike.

Figures from the range, fit and law sections of this review and Eunorau Canada's specification.

Eunorau Canada's specification, with the geometry

Eunorau Canada prints the Specter-S 4.0's full specification, and we read it twice, on 13 and 16 October 2026, with the same result. The table below copies the figures that matter for a buyer from the page and the product record; where the two disagree, both are in the conflicts section.

Eunorau Canada, read 13 and 16 October 2026 (rendered page and product record). The US page prints the same specification block.

Eunorau's Dimensions and Rider Fit table, both frames:

Eunorau Canada, read 13 and 16 October 2026. The fit section reads the saddle height from the crank axle and explains why.

The Bafang G510 and the eleven gears

The motor is a Bafang G510 mid-drive rated at 48 V and 1,000 W, and it drives the chainring, so its power reaches the rear wheel through the same eleven gears your legs use.

Bafang's 2021 OEM workbook lists the M620 drive system as model MM G510.750.C and MM G510.1000.C, with a rated 1,000 W, a maximum of 160 N·m and a Speed and Torque Integrated pedal sensor.

Eunorau's own words for the arrangement: "Instead of driving one wheel directly, the motor can work with the selected gear, giving the rider more control over how power is delivered as the terrain changes." Its 4.0 page names the motor, the thumb throttle and a motor cut-off shift sensor that "briefly interrupts motor assistance during gear changes, helping reduce drivetrain load while shifting." It prints no torque figure and no pedal-sensor type for the 4.0, in the specification or the product record.

The torque has a second source in Eunorau's own catalogue: its Specter-ST 2.0 record lists "48V1000W BAFANG G510/M620 Mid motor with 160 N.m Torque", and its 2024 Specter-S page printed "48V1000W Bafang M620 mid motor with 160 N.m torque" and a "built-in torque sensor". Those are other models. Our range model uses Bafang's 160 N·m as the motor's ceiling and reads the sensor as torque sensing on Bafang's word, never Eunorau's.

Gear choice moves the cost of a kilometre, and most on a climb. On the throttle at 20 km/h on the flat, the model's cheapest cog is the 13-tooth at 10.1 Wh per km, and the 42-tooth costs 12.6. At 25 km/h the 42-tooth is past what the motor can turn, and at 40 km/h so are the 32 and the 42. Up an 8% grade at 13 km/h the order reverses: the 11-tooth needs 72.7 Wh per km and the 42-tooth 41.2.

Watt-hours per kilometre drawn from the cells in each cog, 80 kg rider, level pavement or a paved grade, 25 °C (range model). Past the motor means the G510 cannot hold that speed in that cog: in the large cogs at speed the chainring would turn so close to the motor's 190 rpm no-load speed that too little torque is left, and in the small cogs on a climb it would need more than the motor's 160 N·m.

The suspension

The Specter-S 4.0 has an EXPLORER fork with 140 mm of travel on 36 mm stanchions and an AO-38RC rear shock, 190 mm eye to eye; Eunorau's specification lists "Rear Suspension Travel: 50mm".

Eunorau's page says the pair helps the wheels follow uneven terrain and reduces the impact transferred to the rider, over broken pavement, gravel, trail surfaces and repeated bumps.

Eunorau prints no leverage ratio, so this review takes the rear 50 mm as printed. Eunorau's warranty pages exclude suspension parts from the frame warranty on its Canadian store, and list the rear shock and the fork under 12 months on its en-canada page (warranty section).

Brakes, tires, cockpit, rack and lights

Four-piston hydraulic brakes on 180 mm rotors at both ends, Kenda K-1151 26 × 4.0 tires, a 700 mm riser bar on a 90 mm stem, and an aluminum rear rack, full aluminum fenders and lights front and rear, all on Eunorau's list.

Eunorau writes that the included rear rack "adds a practical carrying platform for compatible bags and cargo accessories."

The rims are 26 × 4.0-inch 6061 aluminum single-wall rims per Eunorau's specification, laced with 12-gauge stainless spokes, 36 holes. The rear hub runs on a 197 mm M12 axle, the front on a 150 mm M15 axle. The display is Bafang's DP C018.CB, and the cockpit and the saddle height are the subject of the fit section, which matters more for this bike than the parts list.

The battery, the second pack and charging

The main pack is 48 V 17.5 Ah, 840 Wh, in a removable downtube case on what Eunorau calls "A lockable battery mount", built from LG 3500 mAh cells in 13 series and 5 parallel with a 30 A battery management system and a 40.5 V low-voltage cut-off.

The optional second pack is 48 V 5 Ah, 240 Wh, from LG 5000 mAh 21700 cells, with a Type-C output; Eunorau's FAQ says it is "included only when that option is specifically offered and selected".

With both packs the model gives 107.2 km at 20 km/h on a full charge and 91 km keeping 15% in reserve, against 83 and 71 km on the main pack alone. The second pack adds 240 Wh, 29% more energy, so it is a range extender for a long day rather than a second full tank. Ask us about it before you order; it is not in the box.

Eunorau's 4.0 listing prints no charger rating and no charge time. Eunorau's FAQ gives the battery care that applies to its packs: keep a stored pack "in a cool, dry place with a 70%-80% charge remaining in it", avoid running it flat ("Charging batteries when they still have 10-15% of power remaining will significantly extend their lifetime"), and expect batteries to "typically last 5-6 years". It gives "10℃ to 55℃" as the optimal operating temperature.

What changed from the 2024 Specter-S

The 4.0 keeps the 1,000 W Bafang mid-drive, the SRAM NX 11-42T gearing and the 26 × 4.0 tires of the 2024 Specter-S, which Zeus lists as the Specter-S 3.0. It adds an included rack and fenders, drops 4.5 lb, moves to 16- and 18-inch frames, and stops printing a torque figure.

The 2024 column is Eunorau Canada's page as archived on 12 December 2024; Eunorau Canada no longer lists that model.

Eunorau Canada, 2024 page (Internet Archive capture of 12 December 2024) against the 4.0 page read 13 and 16 October 2026. The 2024 saddle figure is measured to the ground; the 4.0's is read from the crank axle (fit section), so the two do not compare directly.

The 4.0 against four Eunorau siblings at Zeus

These are the four Eunorau full-suspension siblings at Zeus that sit closest to the 4.0: the 2024 Specter-S at $4,099, the step-through Specter-ST 2.0 with the same motor at $4,099, the lighter 500 W URUS 2.0 at $5,700, and the dual-hub Defender-S 2.0 at $3,799.

Each column is the maker's own record or page, read on 16 October 2026; the 2024 Specter-S column is Eunorau's archived page.

Eunorau Canada records and pages read 16 October 2026 (Specter-ST 2.0, URUS 2.0, Defender-S 2.0), Eunorau's archived 2024 Specter-S page, and Zeus prices read the same day. "Not printed" means absent from both the record and the rendered page.

Pick the Specter-S 4.0 when you carry gear on rough ground and want the rack and fenders in the box. Pick the Specter-ST 2.0 if you need a step-through frame and accept 27.5 × 3.0 tires. Pick the URUS 2.0 for trail riding at 28 kg; Eunorau prints its top speed as 45 km/h in the record and 32 km/h in the page's spec block, so check your province's 32 km/h rule. Pick the Defender-S 2.0 for two driven wheels in snow or sand; our Defender-S 2.0 review computes it the same way. The 2024 Specter-S 3.0 is $1,000 less without the rack and fenders.

How far the Specter-S 4.0 goes on one charge, computed

On the throttle at a steady 20 km/h, an 80 kg rider covers about 83 km on level pavement at 25 °C from the full 840 Wh pack, 54 km at 32 km/h and 33 km at 45 km/h. Keeping Eunorau's advised reserve, plan on 71 km at 20 km/h.

Every figure is computed from Eunorau's own motor, gearing, battery, weight and tire figures; none is a ridden test.

Throttle only, 80 kg rider with gear, 38 kg bike, level pavement, 25 °C air, no wind, the 840 Wh pack (both packs: 1,080 Wh). Speeds above 32 km/h are for land where the speed is allowed (law section).

Pedalling stretches it furthest. At 75 W, an easy effort, the legs of an 80 kg rider alone hold 13.5 km/h on the flat, and at 150 W, a steady one, 20.5 km/h, so below those speeds the battery draws nothing. Above them, every watt you add is a watt the cells do not supply.

Full charge, same conditions as above. "Legs alone" means the rider's effort holds that speed with the motor idle.

What hills cost

Climbing is where a mid-drive spends its energy and earns its gears. At 13 km/h on the throttle, a 4% grade costs 25.0 Wh per km, a full charge's worth of 34 km, and a 12% grade 58.3 Wh per km, 14 km. Each 100 m of climbing at 16 km/h adds about 41 Wh from the cells, against 32 Wh of pure lift for 118 kg at the wheel.

80 kg rider, paved grades, 25 °C, the motor held at or under its rated 1,000 W (a held speed is a sustained load, so the model never prices a climb on peak power).

The fastest pace each grade allows on the throttle, by the weight aboard (rider plus gear):

Range model, throttle only, the cheapest cog that holds the speed. The 150 kg column is Eunorau's product-record figure; its spec panel rates 136 kg (conflicts section).

What your weight costs

Every 20 kg of rider and gear takes a few kilometres from a 20 km/h ride and more from a climb. On the flat it matters less than speed does: 71 km at 20 km/h with 120 kg aboard against 83 km with 80 kg. Up an 8% grade at 16 km/h the gap is 15 km against 20.

Full charge, throttle only, 25 °C.

Does cold weather drain the battery?

Yes, twice: cold cells deliver less of their energy, and cold air is denser to push through. In the model the 20 km/h throttle ride gives 83 km at 25 °C, 66 km at 0 °C, 60 km at −10 °C and 48 km at −20 °C, and the spread across published cell data widens as it gets colder. Below −20 °C the cell data stop, so the model does too.

Cell energy from the McMaster LG HG2 cycler data at a half-C discharge (Kollmeyer). The spread at 0, −10 and −20 °C runs across four cell sources: Samsung SDI's cell specifications (the 35E's among them), NASA JPL's tests of the Samsung 35E (Bugga et al., 2020), Casado et al., 2025, and the HG2 data. The pack starts warm in every row; a pack stored cold starts lower.

Eunorau's FAQ gives its batteries an optimal operating temperature of 10 to 55 °C, so for a November ride, charge and store the pack indoors and fit it just before you leave. Our winter e-bike guide covers riding below zero.

Tires and riding position

In the model, the tire moves the range far more than the riding position does. The model uses Bicycle Rolling Resistance's drum figure for Kenda's Juggernaut Pro 26 × 4.00, the slowest casing of the twelve fat-bike tires on its drum; Eunorau's photograph shows Juggernaut lettering on the K-1151's sidewall. A faster casing would add range.

Full charge, 80 kg, level pavement, 25 °C. Drum figures from Bicycle Rolling Resistance; a 30 tpi wire-bead casing, which Eunorau's photograph shows, was not measured there.

Drag areas from field coast-downs of everyday riders (Tengattini and Bigazzi, 2018); throttle only, full charge.

Eunorau's 64 and 83 km, as rides

Eunorau prints up to 64 km from the main pack and up to 83 km with the optional second pack. Divided out, both ask for about 13 Wh per km, which the model reaches at a steady 27.5 km/h on the throttle, 32.8 km/h with easy pedalling or 36.5 km/h with steady pedalling, for an 80 kg rider on the flat at 25 °C.

The steady speed at which the model's consumption equals the figure Eunorau prints, 80 kg rider, level pavement, 25 °C.

How the range tables are computed

The model holds a steady speed on a steady grade and adds up the watts. The wheel needs rolling plus gravity plus air resistance (Martin et al., 1998); the chain loses 2.3% of that; the motor supplies whatever the rider does not, through the chosen cog; the motor's losses come from Bafang's own no-load and rated speeds; the battery's from a measured 48 V pack (Arango, Lopez and Ceren, 2021); and the cells' energy from the McMaster LG HG2 data at the air temperature.

The physics is the RedTail mid-drive range model, imported unchanged and selftested; its Specter-S figures are reproduced at its own inputs before any Canadian figure is computed.

One ride worked through, wheel to cells: 80 kg aboard, throttle only, 20 km/h, level pavement. Rider and bike weigh 118 kg. Rolling takes 81.2 W and air 58.8 W, so the wheel needs 140.0 W and the chainring 143.3 W. In the 13-tooth cog the chainring turns at 46.9 rpm against 29.1 N·m, where the motor runs at 73% efficiency and draws 195.1 W.

The battery loses another 3.1% inside itself, so the cells give 201.4 W: 10.07 Wh per km, 83.4 km from 840 Wh, 70.9 km with 15% kept.

The model must reproduce the published benchmark before its figures are believed.

How much the range moves if the motor's constants are read differently: the central case, Bafang's printed 80% floor, the 750 W pair, and the 1,000 W pair read at 52 V.

What the payload rating covers

Eunorau's specification panel rates the Specter-S 4.0 at 300 lb, 136 kg, "including rider and cargo", and its product record prints "Maximum Load: 330 lbs", about 150 kg. Until Eunorau settles it, plan on 136 kg: an 80 kg rider can carry 56 kg of gear, a 100 kg rider 36 kg. Both figures are in the range tables.

At the 136 kg rating the model holds 15.1 km/h up a 12% grade on the throttle and gives 67 km at 20 km/h on the flat, against 21.2 km/h and 83 km with 80 kg. The rack is aluminum and Eunorau prints no rack load rating for it, so keep heavy loads low and centred. Our guide to e-bikes for heavier riders covers frames rated past 136 kg.

Will the Specter-S 4.0 fit you? Computed from your height

Measure your barefoot inseam before you choose a frame. At Eunorau's printed saddle heights, read from the crank axle, the 18-inch frame reaches the textbook pedalling height for inseams up to about 76.1 cm and the 16-inch up to about 71.6 cm.

Set a little lower, at 106% of inseam, the 18-inch serves inseams to 78.3 cm and the 16-inch to 73.6 cm.

It is the most important finding in this review, and it runs against Eunorau's own window: its table prints "160–190cm" as the recommended rider height for the 16-inch frame and a dash for the 18-inch. The same page carries an unfinished note, "Publish a recommended rider-height range only after the complete geometry chart and fit guidance have been confirmed." Its frame-size guide places a 16-inch frame in its 158–168 cm row and an 18-inch in its 168–178 cm row.

Every row below comes from 6,068 measured bodies in the US Army's anthropometric survey (ANSUR II), women and men pooled, with the saddle placed along the seat post's measured angle. The target is a saddle 109% of your inseam above the pedal at the bottom of its stroke, the figure Peveler and colleagues measured against knee angle; the recommended range runs from 106% to 109% of inseam (Ferrer-Roca et al., 2012).

The 18-inch frame's printed 540–660 mm, placed along the measured post: 88 to 100 cm from the ground. ANSUR II bodies on Eunorau's 170 mm cranks.

The 16-inch frame's printed 490–610 mm, placed the same way: 84 to 95 cm from the ground.

Where the 18-inch range runs out, the median rider's saddle sits 3.1 cm below the formula at 165 cm, 5.8 cm at 170 cm and 8.4 cm at 175 cm. A saddle that low means more knee bend at the bottom of each pedal stroke than the 25 to 35 degrees the studies target (Peveler et al., 2007).

Eunorau prints a 31.6 × 280 mm seat post. Whether a longer post fits this seat tube, and how far one must be inserted, is not printed, and we have not tested one, so this review recommends none.

Can I put a foot down at a stop?

On the 18-inch frame, 29 of 100 riders at 160 cm clear the top tube barefoot, 70 at 165 cm and 96 at 170 cm. Eunorau prints no standover, so it is read from its photograph of the 18-inch frame: the top tube's upper edge about 5 cm in front of the saddle's nose stands 77.7 cm off the ground.

Barefoot; shoes add a little height. The 16-inch frame's top tube is not photographed by Eunorau, so it is not measured here.

Will I feel stretched out?

Expect a trail lean: on the 18-inch frame the median rider tips 27 degrees from vertical at 160 cm and 22 at 175 cm to reach the grips, and the hands carry about 19% of body weight at 160 cm with the back relaxed. On the 16-inch the saddle sits lower for the same rider and the lean eases: 24 degrees at 160 cm.

The least lean at which a straight arm reaches the grip from the sit bones, and the upper-body weight that lean puts on the bar (segment weights from Clauser et al., 1969). Ten road racers on the brake hoods put 15% of their weight on the stem (Carahalios, 2015).

A trunk you hold up yourself takes some of that load off, so read each row as the ceiling. On a long day, padded gloves help: across 36 experienced cyclists they cut pressure over the ulnar nerve by 10 to 28% (Slane et al., 2011).

How do I set the saddle when it arrives?

Aim for 25 to 35 degrees of knee bend at the bottom of the pedal stroke (Peveler et al., 2007). The heel check gets you there fastest: rest your heel on the low pedal and raise the saddle until that leg just straightens. Among 19 trained cyclists it landed 70% inside the knee range, better than either inseam formula (Peveler et al., 2005). Stay inside the insertion mark on the seat post.

How we computed fit

A worked case: a rider of 173 cm with an 82.9 cm inseam, the survey's median at that height. The formula puts the saddle 90.4 cm above the pedal; take off the 170 mm crank and it is 73.4 cm from the crank axle (LeMond's 88.3% of inseam gives 73.2). Placed on this frame's 72.1-degree post line at that distance from a crank axle 35.5 cm off the ground, the saddle top sits 106.8 cm up, above the 18-inch frame's 100 cm and the 16-inch frame's 95 cm.

Before any point was read, the photograph's scale (8.19 pixels per cm, from the 1,274 mm wheelbase) was checked against Eunorau's table; the checks are in the next table. LeMond's figure plus the crank works out to 109.0% of inseam across all 6,068 bodies, against 109.2 ± 0.9% in trained cyclists.

The 18-inch frame, measured on Eunorau's photograph at the wheelbase's scale. Total length, bracket height and effective top tube land within 1.4% of Eunorau's table. The seat-tube row is measured to the top of the clamp ring; to the tube's own top it reads 45.8 cm, within 0.3%. The chain stay, stack, reach and head tube measure 6.9 to 15.6% longer than Eunorau prints; the cockpit rows use the grip where the photograph shows it, not the table's stack and reach.

Seven Canadian riders, one bike

The same machine is the right buy for some riders and the wrong one for others. Each row below applies the fit, range and law sections to one rider; find yours.

Figures from the fit, range and law sections of this review.

What the law calls it, province by province

Nine of Canada's thirteen provinces and territories define an e-bike, and all nine stop at 500 W; New Brunswick's registry guidance uses the same 500 W, and Newfoundland and Labrador, the Northwest Territories and Nunavut have no e-bike definition. The Specter-S 4.0's G510 is a 1,000 W motor, so on 16 October 2026 it met none of them.

Canada has had no federal e-bike definition since the federal power-assisted-bicycle definition was repealed effective February 4, 2021 (SOR/2020-22), so the rules are provincial and territorial. Where no e-bike definition applies, a 1,000 W machine falls to each jurisdiction's motor-vehicle or off-road-vehicle rules, which is why this review calls it an off-road machine: ride it on private land with permission, or where your province's off-road rules allow. Our guide to e-bike laws in Canada carries the age, helmet and passenger rules the table leaves out.

Each row's operative words are quoted from the statute, regulation or regulator page linked in it. Our saved copies were fetched on 13 October 2026 and re-checked on 16 October 2026; the SAAQ and Nunavut pages refused our reader on 16 October 2026 (a verification challenge), so those rows rest on the 13 October copies. This table is a reading of the definitions, not legal advice.

The 45 km/h display limit

Eunorau Canada's header calls the bike "Class 2 Speed limited Unlockable" and its specification lists a manufacturer-defined display limit of up to 28 mph, approximately 45 km/h; the US page reads "Default Class 2". Class 2 is a US label; the provincial definitions in the law table use wattage, speed and pedals instead.

Eunorau prints no km/h figure for the setting the bike ships in.

For the e-bike definitions the setting changes nothing, because the motor already decides them at 1,000 W. What 45 km/h does change is energy and stopping: the model gives 33 km at 45 km/h against 83 km at 20, and the 180 mm rotors stop 118 kg of bike and rider from a higher speed. Our wattage guide works through what each province allows.

Where Eunorau prints a figure two ways

Some of Eunorau's own figures for the Specter-S 4.0 disagree between its rendered page, its product record, its tables and its US page, one leaves its measuring point unstated, and one sits beside an unfinished editorial note.

We print both readings and use the more conservative one; none of these is a criticism of the bike, and each is worth a call before you order.

Eunorau Canada page and record read 13 and 16 October 2026; US page read 13 October 2026 (US listing).

Recall record

We found no Health Canada recall or safety alert and no US Consumer Product Safety Commission recall naming Eunorau, the Specter or the Hunter X9. We searched Health Canada's recalls and safety alerts (archived records included) for four names, and the CPSC's recall database in three fields, each with a control search that had to return records first.

Searches run 13 October 2026 and again on the day of publication; word-boundary matching, so a word that merely contains a name is not counted. A name search is a floor: a recall filed under a reseller's name would not appear.

Is it UL certified?

Eunorau Canada's header row for the Specter-S 4.0 reads "UL CERTIFIED" and "Yes", and names no standard, no file number and no certifying laboratory. UL 2849 covers "the electrical system of eBikes" and UL 2271 batteries for light electric vehicles; without a standard named, we cannot say which, if either, applies to this bike.

Ask us and we will put the question to Eunorau in writing.

Warranty, Zeus Care and who handles a claim

The warranty is Eunorau's, backed by Eunorau in full as it publishes it, and Zeus handles the claim for you. Eunorau publishes two Canadian terms: its Canadian store's page lists a 10-year frame and 24 months for the battery, motor and electrical components, and its en-canada page lists a 5-year frame from production date, a 2-year prorated battery and 12 months for the motor, fork and rear shock.

Both pages read 13 October 2026; the store page re-read 16 October 2026 (unchanged). The two pages are not reconciled on Eunorau's sites; until they are, read both, and call us before you rely on either.

On top of that, Zeus Care is our Canadian support service: your first month is included with the bike, and plans run $119 for 1 year, $229 for 2, $339 for 3 and $599 for 5. In our warranty page's words, "Zeus Care is a service, not a warranty": remote diagnostics, assembly walkthroughs, maintenance guidance and handling of the claim with the manufacturer. "It does not add coverage or extend the manufacturer's warranty."

Buying it from Zeus

The Specter-S 4.0 is $5,099 at Zeus in all four combinations, Moon Black or Army Green in a 16- or 18-inch frame, read on 16 October 2026, with free shipping across Canada.

Our policies set the rest: cancel at no cost within 24 hours, return an unused, unopened bike within 15 days of delivery with a 15% restocking fee, and a dead-on-arrival rule for the first 14 days.

Zeus listing and policy pages read 16 October 2026.

The honest ledger

Seven things count in the Specter-S 4.0's favour and seven against it, each from a section above. Read the second list as carefully as the first; none of the red flags is hidden on Eunorau's page, but several are easy to miss.

Who should buy it

Buy the Specter-S 4.0 if you ride private land, farm tracks or trails that permit a 1,000 W machine, carry gear, climb, and fit the frame. It is a capable climber with the carrying kit included, priced at $5,099.

Skip it for a road commute, if you need a step-through, or if your inseam is longer than the 18-inch frame's printed range serves.

Before you buy: the checklist

Seven checks settle every open question in this review before you order. Do them in this order: your inseam decides the frame, the land decides whether a 1,000 W machine can go where you ride, and the rest settle the load, the second pack, winter storage and the warranty.

1. Measure your barefoot inseam against a wall with a book, and find your row in the fit tables.
2. Name the land you will ride and confirm it permits a 1,000 W machine; read your province's row in the law table.
3. Weigh yourself with your gear, and keep the total under 136 kg.
4. Decide whether a 240 Wh second pack is worth it for your longest day.
5. Plan indoor storage and charging for the battery between November and March.
6. Read both of Eunorau's Canadian warranty terms, and register the bike when it arrives.
7. Call 1-866-938-7580 with anything this review left open.

Limitations of this review

Nothing in this review is a test ride. The range and fit figures are computed from Eunorau's published numbers and published research, and each has limits we can name. The nine below are the ones a buyer should weigh, starting with the model's flat, windless pavement.

1. The range model holds a steady speed on pavement with no wind, stops or loose ground; snow, mud and sand cost more than any row.
2. The motor constants are Bafang's published figures for the M620; no measurement of this motor in this bike was found.
3. The tire figure is Bicycle Rolling Resistance's drum test of the Juggernaut Pro; the 30 tpi wire-bead casing on this bike was not measured there.
4. The cold rows start from a warm pack; a pack stored in the cold starts lower, and below −20 °C the cell data stop.
5. The fit model's bodies are US Army personnel aged 17 to 58, measured 2010 to 2012, rather than the Canadian public.
6. The saddle rows read Eunorau's saddle height from the crank axle to the saddle's top; if Eunorau measures to the clamp, more riders fit (fit section).
7. The 18-inch geometry is read from Eunorau's photograph; the 16-inch top tube is not photographed, so its standover is not computed.
8. The law table reads definitions; it is not legal advice, and off-road rules for land and trails vary by owner and municipality.
9. Eunorau's figures can change; we read them on 13 and 16 October 2026.

The source register

Every source this review uses, with what it supplied and when we read it. Primary sources come first, and every link opens the page or document itself, at the deepest address we could reach; where a host refused our reader on the day of publication, the table says when we last read it.

Copies of every source are saved: the maker, store, law and recall sources with this review's research record, and the range and fit model sources with the research record of the model it imports.

The bottom line

The Eunorau Specter-S 4.0 is a $5,099 full-suspension fat-tire bike with a 1,000 W Bafang G510 mid-drive through SRAM NX 11 speeds, four-piston brakes, an 840 Wh LG pack and a rack and fenders included, rated to 136 kg, and on 16 October 2026 it met no provincial or territorial e-bike definition, because its motor is 1,000 W.

On the throttle an 80 kg rider covers about 83 km at 20 km/h and 54 km at 32 km/h, and it holds 21.2 km/h up a 12% grade. Buy it for climbing with load on land where a 1,000 W machine may go; measure your inseam first, because on the 18-inch frame the printed saddle range serves most riders up to about 155 cm at the textbook height and about 160 cm set a little lower.

The low-pressure route is open: call 1-866-938-7580 and we will check the frame against your inseam; cancel within 24 hours at no cost; after delivery, an unused, unopened bike can be returned within 15 days under our refund policy (15% restocking fee); and the financing guide works the monthly cost through before you decide.

Photographs: Eunorau's own product photography of the Specter-S 4.0, used unaltered apart from crops. The cover is a Playcut.ai rendering of Zeus with the bike, made from Eunorau's photograph as its reference: an illustration of the bike, not Eunorau's photograph. No other image on this page was generated or altered by an image model.