Eunorau Specter-S 1000W All-Terrain Fat Tire Electric Mountain Bike

2 reviews

FREE Shipping to US Lower 48
DAILY Inventory Updates
NEED HELP? Call 888-883-3350

Army Green
Leaf Camo

Powerful 1000W Bafang M620 (Ultra) Mid-Drive Motor System with Torque & Speed Sensors

48V/17.5Ah Downtube-Integrated Battery w/ Samsung Cells (Additional Dual Battery Optional)  

Front and Rear Hydraulic Disc Brakes w/ 180mm Rotors & Auto Motor Cutoffs

11-Speed SRAM NX Drivetrain System

5-Level Pedal Assist System w/ Thumb Throttle

Kenda Krusade Sport 26" x 4.0" Tires w/ K-Shield Protection

eunorau bikes authorized dealer logo for really good ebikes

Introducing Specter-S

The Specter-S from international ebike brand Eunorau (pronounced U-Nor-O) is a high-end electric mountain bike featuring premium components throughout, and some truly innovative ebike technology. It has been designed for the most rugged outdoor riding conditions, with an aircraft-grade 6061 aluminum alloy frame, full-suspension diamond mountain bike frame, hydraulic disc brakes, and puncture-resistant fat tires. And the electronics are top notch, including the Bafang Ultra mid-drive engine and an integrated dual battery configuration for longer rides per charge. The Specter-S is ideal for off-road enthusiasts, mountain bikers and hunters alike.

Specter-S Fat Tire Ebike Description

If you need an electric mountain bike with incredible hill-climbing and towing capability, the Specter-S is for you. This model features the highly capable 48-volt Bafang M620 Ultra Mid-Drive System, which includes the G510 mid-drive motor. The Ultra motor has a nominal output of 1000 watts (1500W peak output), and up to 160 Newton Meters (Nm) of torque, unmatched in the world of ebikes. This mid-drive motor uses one torque sensor and 2-speed sensors, creating a highly responsive and efficient. The torque sensor is ideal for slow and technical rides over very diverse terrain. The motor can be programmed to operate at a maximum of 750W for use in restricted areas.

The heavy-duty full-suspension frame of the Specter-S is hand-crafted from 6061 aluminum, giving the bike incredible strength. It is offered in 17” and 19” sizes, and comes in stunning black and gorgeous grey finishes. The inverted front shock is made by Eunorau and provides up to 140mm of travel. The rear shock is DNM model A0-42RC, which features a dark hard-anodized AL-7075 ∅10 mm ( 0.39”) damper shaft, adjustments for rebound, lockout and high pressure, and delivers up to 190mm of travel. Cables are threaded through the frame for a clean design. The battery is integrated into the downtube portion of the frame, with the option for a second battery added on top of the downtube.


The Specter-S has 5 levels of pedal assist, allowing you to finely adjust how much power the motor puts out. It also features a thumb throttle, which allows for riding without pedaling (very stealthy). The Specter-S also features a Sram NX 11-speed derailleur, providing smooth, reliable and fast shifting action, eliminating unwanted chain movement and an end to ghost shifting.

The 48V/17.5Ah battery on the Specter-S is located within the downtube, providing an added level of stealth and aerodynamics to the frame. This battery is packed with Samsung cells. If you really want to extend the range of your ride, there is an option to buy a second 48V/14Ah battery, which mounts on top of the downtube. The controller adjusts the draw from each battery automatically based on voltage and demand. The range these batteries are capable of achieving will vary based on a number of significant factors, including terrain, load, and demand. Please use our Ebike Range Calculator to estimate your expected range per charge.

The Specter-S is a very capable fat tire electric hunting bike, designed especially for natural trails and rugged off-road terrain. You will appreciate the highly responsive torque sensor, that will make slow technical riding feel natural and intuitive. This electric mountain bike is a favorite of hunters, allowing you to travel great distances to follow game, monitor cameras, and visit remote watering spots. The Kenda Krusade Sport 26” x 4” fat tires designed for use with ebikes, feature dense 30 TPI casings, wire beads and K-Shield protection.

eunorau specter-s control panel

Kenda's first line of defense since 1995: a layer of light, flexible rubber containing aramid and ceramic particles inside the tire, under the tread area only. This has been designed to prevent punctures and increase tire life. The Kenda Krusade tire features a reflective sidewall stripe and Kenda's K-Shield puncture-resistant tire liner.

These tires will provide excellent traction and stability on uneven and gravely surfaces, and can be ridden on snow and sand. For a wider footprint, you can deflate the tires down to 5psi, or pump them up to 30psi when you ride on paved surfaces and want a more responsive feel and performance.

When it comes to stopping with authority, the Specter-S does not disappoint. It features a hydraulic brake system with 180mm stainless steel rotors front and rear, and automatic brake/motor cutoff sensors, so you will never risk motor acceleration during braking.

Electric bikes are an excellent form of transportation, even a highly specialized ebike like the Specter-S. They can be ridden in bike lanes and other areas where cars are prohibited; they have zero emissions and are therefore a greener, ecologically-friendly alternative to cars.

Ultra Mid-Drive Motor

The Specter-S was designed and engineered around the unparalleled power and performance of the Bafang Ultra 1000W mid-drive motor, with its game-changing torque and dual-speed sensors. These highly sensitive sensors record data on crank torque, vehicle speed, and pedal rotation speed, ensuring precise control of the bike while achieving the highest possible efficiency. The Ultra motor can be programmed down to 750W for street use.

The new Bafang Ultra mid-drive electric motor looks similar to other mid-drive electric bicycle motors from Bosch, Panasonic and Brose, but it is a next-generation ebike motor like no other. Don’t be fooled by the 1,000W nominal motor output specification; under the hood, the Bafang Ultra is capable of pulling 1,600W from the battery using only its stock settings.

At 160 newton meter (Nm), the torque rating on the Bafang Ultra is also through the roof; it is far more torque than any other mid-drive on the market today. The best and latest models from other industry leaders are only now reaching 90 Nm, meaning the Bafang Ultra packs well over twice the torque of most of its competitors. That translates into wheelie popping, seat-of-the-pants thrill riding that most people have never experienced before on a bicycle.

To increase the torque, Bafang started with a much larger diameter motor than is conventionally used for ebike mid-drives. Its larger diameter rotor means the motor can pull harder against its magnets, providing extra high power and torque. That larger diameter also increases efficiency, as the relative speed of the magnets passing by the motor coils is faster. The magnets on the Bafang Ultra are also mounted slightly further from the copper coils, which keeps them cooler, also increasing efficiency.

The Bafang Ultra’s internal controller is also optimized for extremely high power. Most mid-drive motors use 6 MOSFETs, the small internal circuits that control power flow to the motor. But the Bafang Ultra doubles the standard with 12 MOSFETs. That opens the door to higher power and less energy lost as heat waste.

The Bafang Ultra also uses triple gear reduction inside the motor, unlike the double reduction found in most competitors. The gears are helical-cut, which helps reduce noise. Of course, it won’t be nearly as whisper quiet as Brose’s famous belt reduction mid-drives, or the Bafang BBHSD motor with its teflon gears, but it certainly won’t be as loud as the old school straight cut gears still found in some mid-drives.

Lastly, the Bafang Ultra incorporates a torque-sensing ISIS bottom bracket. That results in extra-smooth power application that mimics a rider’s natural pedal force (but amplified many times, of course). 

Eunorau Specter-S Specifications

  • MOTOR: 1000W Nominal (1500W Peak) Bafang G510/M620 (Ultra) Mid-Drive Motor with (1) Torque and (2) Speed Sensors; 160Nm Torque
  • FRAME: Aircraft-Grade 6061 Aluminum Alloy w/ Full Suspension & Integrated Electronics
  • FRONT FORK: Eunorau Inverted Fork w/ 140mm Travel + Lockout
  • REAR SHOCK: DNM AO-42RC w/ 190mm Travel
  • MAXIMUM SPEED: 35 mph
  • BATTERY: 48V/17.5Ah Downtube-Integrated w/ Samsung Cells  w/ Optional 2nd Downtube-Mounted 48V/14Ah for Dual Configuration
  • DRIVE MODES: 5-Level Pedal Assist System (PAS); Thumb Throttle; 11-Speed Gears
  • DISPLAY: TFT 860C LCD Color Display (860C Manual)
  • LIGHTS: Integrated Front LED Headlight and Taillight
  • RIMS: 26" Black Alloy
  • SPOKES: Stainless Steel
  • TIRES: Kenda Krusade Sport Tires 26" x 4.0" with K-Shield Protection (Tire model may vary due to supply shortages)
  • GEARS: SRAM NX 11-Speed Gears
  • SPROCKET: 42T Bafang Chain Wheel
  • BRAKESDual Hydraulic Disc Brakes w/ 180mm Rotors & Auto Motor Cut-Off Sensors 
  • BRAZONS: Attachment Points for Rear Rack & Fenders
  • PEDALS: High-Quality Nylon Pedals
  • BIKE WEIGHT: 79 Lbs.
  • BOX DIMENSIONS & WEIGHT: 67" x 13" x 33.4" (101 Lbs.)
  • ASSEMBLY: The Specter-S comes mostly assembled. Final assembly includes attachment of the pedals, handlebar, front wheel and light. Please see the assembly video below.
  • TOOLS: Tools for Final Assembly Included
  • SHIPPING: Free shipping to the lower 48. We are unable to ship this brand to Alaska or Canada at this time. For shipments to Hawaii,please send us your shipping address and the products you want, and we will find the best rate available.

Eunorau Ebike User Manual

Electrified Reviews

Brent McCluskey of Electrified Reviews gives the Specter-S a big thumbs up in this review. Check it out.

Specter-S Assembly Video

Orders for in-stock items take 24-48 hours to process, then about 5-7 days in transit. Delays due to Covid have occurred. If an item is on backorder, the estimated ship date will be shown below the Pre-Order Button.

All products are shipped free within the Contiguous US via UPS, FedEx or similar carrier. Shipping to AK, HI and PR may incur additional charges.

If your package appears damaged from shipping, please do not accept it. Tell the driver to keep the package and contact us immediately at 888-883-3350. We offerGuide Package Protectionto ensure against lost, stolen or damaged goods. Click here to learn more about Guide.

Returns for buyer’s remorse are typically not accepted by our suppliers, and if accepted, the customer may incur shipping and restocking fees.

Please click here to read our entire Shipping & Returns Policy.


Ask a Question
  • I was wondering if the las vegas location does any service on bikes.

    The Las Vegas warehouse services batteries and other parts, but most service that might be required can be rendered by a local bike shop.

  • How much does the specter-s weigh?

    86 lbs.

  • What options are available for this bike? Is there a pannier rack and mud fenders available for this bike?

    The Specter-S has standard attachment points for fenders and a rear rack, but does not come with their accessories.

Customer Reviews
5.0 Based on 2 Reviews
5 ★
4 ★
3 ★
2 ★
1 ★
Write a Review

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:

    Great Off-Road Bike

    I love this bike. It was easy to ride, sturdy high-quality, and worked well out of the box after a simple assembly. I always say 'more power more fun' and this bike has power by the buckets. What an Amazing Machine!!!!

    Shawn D.

    Buying an e-bike online

    I was not sure what to expect buying an e-bike online.Talking to Steve at GRE on the phone was a good first step. We talked about what I was looking for, ultimately zeroing in an a mid-priced bike (but still expensive - at least for me). There was the usual COVID delay. When the bike arrived, it was a snap to set up (about 30 minutes). My only complaint was the quality of the instructions which were very poor. But the setup was easy enough so it was not a big deal. RGB had my back through the whole process. I now have my Eunorau Spector-S set up as a snow bike for the winter with studded tires and handlebar mitts, and am having a blast on snow mobile trails!

    Mark J.
    United States United States

    Really Good Ebikes

    It was a pleasure assisting you. Thank you for the awesome review. Glad to hear you are having a blast on your new Specter-S.