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Built for challenging terrain and all-season exploration, the SPECTER-S 4.0 combines powerful mid-drive performance, long-travel full suspension, and wide fat-tire stability. A 1000W BAFANG mid-drive motor, 140mm front suspension, and 26 × 4.0-inch fat tires come together in a full-suspension platform built for changing terrain.
The 1000W BAFANG G510 mid-drive motor sends power through the bike’s drivetrain, while the removable 48V 17.5Ah battery provides energy for everyday riding and off-road adventures. A 140mm suspension fork, rear shock, four-piston hydraulic disc brakes, and SRAM NX 11-speed drivetrain help you stay in control across hills, loose surfaces, and uneven trails.
Key Features
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1000W Mid-Drive Power: The BAFANG G510 mid-drive motor works through the 11-speed drivetrain, giving you more control over how power is delivered as the terrain changes.
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Long-Travel Full Suspension: A 140mm EXPLORER fork and AO-38RC rear shock with 50mm travel help the wheels follow uneven terrain and reduce impact to the rider.
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SRAM NX 11-Speed: An NX trigger shifter, long-cage derailleur, and PG-1130 11–42T cassette cover climbs, cruising, and changing gradients.
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Four-Piston Hydraulic Brakes: Front and rear HD-E620 four-piston brakes with 180mm rotors provide controlled stopping.
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26 × 4.0-Inch Kenda Fat Tires: Wide Kenda K-1151 tires create a broad contact patch for stability across loose and uneven surfaces.
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48V 17.5Ah Removable Battery: LG cells in a lockable, removable downtube battery deliver up to 40 miles of estimated range.
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BAFANG Handlebar Display: The DP C018.CB display keeps essential riding information and assist controls within easy reach.
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Aluminum Rear Rack and Fenders: An included rear rack and full aluminum fenders make the bike ready for cargo and everyday transportation.
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Eunorau Comfort C7 Saddle: The wide, contoured C7 saddle provides supportive comfort for daily commuting and relaxed weekend rides.
Power Through the Gears
The 1000W BAFANG G510 mid-drive motor sends power through the bike’s drivetrain. 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.
Mounted near the center of the bike, the drive unit also keeps the main source of motor weight close to the frame’s center. This central motor position helps distribute weight more evenly and allows the motor to take advantage of the bike’s gearing when climbing or adapting to changing terrain.
- 48V / 1,000W BAFANG G510 mid-drive system
- Power delivered through the 11-speed drivetrain
- Thumb throttle for additional motor control
More Control When the Ground Gets Rough
The EXPLORER suspension fork provides 140mm of front travel, while the AO-38RC rear shock adds 50mm of rear suspension travel. Together, they help the wheels follow uneven terrain and reduce the impact transferred to the rider.
The result is a more composed ride across broken pavement, gravel, trail surfaces, and repeated bumps. The full-suspension design helps provide greater comfort, stability, and control when riding across trails, gravel roads, and rough terrain.
- 140mm front suspension travel
- AO-38RC rear shock
- 190mm eye-to-eye shock length with 50mm travel
Choose the Gear Before the Terrain Chooses for You
The SRAM NX 1 × 11 drivetrain combines an NX trigger shifter, long-cage rear derailleur, and PG-1130 11–42T cassette. The wide gear range helps riders prepare for climbs, settle into a cruising cadence, and respond to changing gradients.
A motor cut-off shift sensor briefly interrupts motor assistance during gear changes, helping reduce drivetrain load while shifting.
- SRAM NX 1 × 11-speed drivetrain
- SRAM PG-1130 11–42T cassette
- KMC e11 Sport chain
Built for the Surface Beneath You
Motor output is only part of the ride. Braking, grip, gearing, visibility, and cockpit control work together to help the rider manage the bike across changing conditions.
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26 × 4.0-Inch Kenda Fat Tires: The wide Kenda K-1151 tires create a broad contact patch for added stability across loose and uneven surfaces. They help the bike maintain control across gravel, dirt, sand, snow, and other loose or uneven surfaces. The 26" × 4.0" aluminum rims use 12-gauge stainless-steel spokes to support the demands of a powerful fat-tire e-bike.
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Four-Piston Hydraulic Brakes: Front and rear HD-E620 four-piston hydraulic brakes use 180mm rotors for controlled stopping performance. The hydraulic system provides consistent braking control across changing terrain and riding conditions.
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SRAM NX 11-Speed: An 11–42T cassette provides a practical range of gears for climbs, cruising, and changing terrain.
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BAFANG Handlebar Display: The DP C018.CB display keeps essential riding information, pedal-assist settings, and system controls within easy reach. A thumb throttle provides additional motor control, while the manufacturer-defined display speed limit is set to a maximum of 28 mph.
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Aluminum Rear Rack: The included rear rack adds a practical carrying platform for compatible bags and cargo accessories.
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Eunorau Comfort C7 Saddle: The wide, contoured C7 saddle provides supportive comfort for daily commuting and relaxed weekend rides.
48V 17.5Ah Removable Battery
The removable downtube battery uses LG 3500mAh cells in a 13S5P configuration. A lockable battery mount helps secure it to the frame, while the removable design gives riders more flexibility when charging or storing the battery.
The included battery delivers up to 40 miles of estimated range. For longer adventures, add an optional second battery and extend the combined riding range up to 52 miles.
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17.5Ah: Main battery capacity
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LG Cells: Reliable battery performance
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Removable: Lockable downtube design
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Range: Up to 40 miles
Optional Secondary Battery Configuration
An optional 48V 5Ah secondary battery configuration uses LG 5000mAh 21700 cells and includes a Type-C output for compatible portable devices.
The secondary battery is an optional configuration and is not included unless specifically selected.
Adventure-Ready Equipment
The SPECTER-S 4.0 is equipped with an aluminum rear rack, full aluminum fenders, a front light, rear safety light, adjustable kickstand, and platform pedals. These practical components make the bike ready for recreational riding, trail exploration, and everyday transportation.
Know the Platform Before You Choose
The SPECTER-S 4.0 is built around a 16/18-inch full-suspension frame and 26-inch fat-tire platform. A 700mm handlebar, 90mm stem, and 170mm crank define the main rider contact dimensions.
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Frame size: 16/18in
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Wheel size: 26 × 4.0 in
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Handlebar width: 700mm
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Stem length: 90mm
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Crank length: 170mm
Suitable For:
- Trail exploration
- Gravel roads
- Hunting and backcountry access
- Sand, snow and loose surfaces
- Recreational riding
- Everyday transportation
Please Note: Default Class 2. Manufacturer-defined display limit up to 28 mph / approximately 45 km/h.
Please Note: The 48V 5Ah secondary battery is optional and not included unless specifically selected; combined range up to 52 mi requires it.
Please Note: Compatible accessories listed on the page: 48V 5Ah Secondary Battery with Type-C port, Single Speed Cassette Conversion Kit, 27.5 x 3'' Wheel Set for SPECTER-S, cargo/hunting trailers, Genesis adult helmet.
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Specifications
Electronics
Motor: BAFANG G510 mid-drive motor
Motor position: Mid-drive
Motor output: 48V / 1,000W
Main battery: 48V 17.5Ah removable downtube battery
Main battery cells: LG 3500mAh, 13S5P
Battery management system: 30A BMS
Low-voltage protection: 40.5V
Charge port: DC2.1
Display: BAFANG DP C018.CB
Communication protocol: UART
Throttle: Thumb throttle
Shift protection: Motor cut-off shift sensor
Optional secondary battery: 48V 5Ah, LG 5000mAh 21700 cells, 13S1P
Optional secondary battery BMS: 30A
Optional secondary-battery feature: Type-C output
Dual-battery switcher: 40A × 2 input configuration
Performance
Class: Default Class 2
Manufacturer-defined display limit: Up to 28 mph / approximately 45 km/h
Range: Up to 40 miles / 64 km
Extended range - optional battery: Up to 52 mi / 83 km combined*
Maximum payload: 300 lb / 136 kg, including rider and cargo
Net weight: 83.7 lbs / 38 kg
Frame & Suspension
Frame: 6061 aluminum full-suspension
Frame size: 16" / 18"
Wheel size: 26 inches
Front fork: EXPLORER suspension fork
Front suspension travel: 140mm
Fork stanchions: 36mm
Front hub spacing: 150mm
Rear shock: AO-38RC
Rear shock size: 190mm eye-to-eye
Rear suspension travel: 50mm
Drivetrain
Drivetrain: SRAM NX 1 × 11-speed
Shifter: SRAM NX 11-speed trigger shifter
Rear derailleur: SRAM NX 1 × 11 long cage
Cassette: SRAM PG-1130, 11–42T
Chain: KMC e11 Sport
Chainring: 40T
Crank length: 170mm
Crank material: Aluminum
Brakes
Brake type: Front and rear four-piston hydraulic disc brakes
Brake model: HD-E620
Front rotor: 180mm
Rear rotor: 180mm
Wheels & Tires
Tires: Kenda K-1151, 26 × 4.0 inches
Rims: 26 × 4.0-inch 6061 aluminum single-wall rims
Front hub: 12G × 36H, M15 × 150mm
Rear hub: 12G × 36H, M12 × 197mm
Spokes: 12-gauge, 36-hole, 304 stainless steel
Cockpit & Equipment
Handlebar: 700mm aluminum riser handlebar
Handlebar rise: 25mm
Stem: 90mm aluminum stem
Grips: 130mm dual-lock grips
Seatpost: 31.6 × 280mm aluminum
Saddle: Eunorau Comfort C7 saddle
Pedals: 9/16-inch platform pedals with reflectors
Front light: 6–48V DC light with reflector
Rear safety equipment: Rear light with reflector
Rear rack: Aluminum
Fenders: Full aluminum front and rear fenders
Kickstand: Adjustable aluminum kickstand
Geometry & Sizing
16" frame: recommended rider height 160–190 cm (5'3"–6'3"). EUNORAU does not list a separate rider-height range for the 18" frame.
| Measurement |
16" |
18" |
| A: Seat tube |
406mm / 16in |
457mm / 18in |
| B: Reach |
457mm / 18in |
457mm / 18in |
| C: Head tube |
160mm / 6.3in |
160mm / 6.3in |
| D: Chain stay |
421.5mm / 16.6in |
421.5mm / 16.6in |
| E: Bracket height |
360mm / 14.2in |
360mm / 14.2in |
| F: Wheelbase |
1274mm / 50.2in |
1274mm / 50.2in |
| H: Top tube |
645mm / 25.4in |
645mm / 25.4in |
| I: Stack |
618mm / 24.3in |
618mm / 24.3in |
| K: Total length |
2024mm / 79.7in |
2024mm / 79.7in |
| Saddle height |
490–610mm / 19.3–24in |
540–660mm / 21.3–26in |
| Recommended rider height |
160–190cm / 5'3"–6'3" |
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What is the advantage of the mid-drive motor?
The BAFANG G510 motor delivers power through the bike’s drivetrain, allowing the motor to work with the selected gear. This gives the rider more control over power delivery as terrain and gradients change.
How much suspension travel does the bike have?
The EXPLORER front fork provides 140mm of travel. The AO-38RC rear shock has 50mm of travel and a 190mm eye-to-eye length.
Is the main battery removable?
Yes. The 48V 17.5Ah battery uses a lockable, removable downtube design, allowing it to be removed for charging or storage.
Is the 48V 5Ah secondary battery included?
No. The 48V 5Ah secondary battery is an optional configuration and is included only when that option is specifically offered and selected.
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EUNORAU 24-Month+ Limited Warranty
Coverage
- Frame: 10-year limited warranty (replacement or repair)
- Battery: 24 months
- Motor: 24 months
- Electrical components: 24 months
EUNORAU's limited warranty covers manufacturing defects for the original retail purchaser of EUNORAU electric bicycles bought in the U.S. or Canada. It does not cover normal wear and tear or labor costs, and it is not transferable to a subsequent owner.
Warranty Start Date and Registration
For products bought from an authorized EUNORAU dealer, the warranty begins on the original purchase date shown on the purchase invoice or receipt. If proof of purchase can't be provided, the warranty start date is 90 days after the product's manufacturing date, as determined by its serial number. Register your product with EUNORAU promptly after purchase so warranty and after-sales claims can be processed quickly. EUNORAU recommends an inspection by an authorized specialist or dealer after the first year of use. Products used commercially (rental fleets, delivery services, sharing programs) have the standard warranty period reduced by 50%.
Frame Warranty
Covers a replacement or repaired frame only; labor to move parts to a replacement frame is not included. EUNORAU may use scratch-and-dent stock, and frame styles or colors not in stock may be replaced with a compatible style or color. Excluded: corrosion; paint fade, scratches and impact marks; impact damage; non-reversible modification such as drilling or welding; chain guard mounts; and suspension parts.
What Is Not Covered
Ordinary wear and tear (including brake pads, rotors, spokes, grips, shifters, brake cables, casings, tires and tubes, chains, chainrings, cassettes and transmission gears); corrosion from the elements; cosmetic damage or deterioration of the finish; labor for part replacement; damage from accident, abuse, misuse, stunt riding, racing, improper storage, neglect, or exposure to liquids, chemicals, sand or dirt; scratches and dents not caused by EUNORAU; products with a removed or altered serial number or bar code; damage caused by accessories or equipment not furnished or approved by EUNORAU; improper assembly, operation, maintenance or repair that varies from the assembly instructions and manual; external causes such as collision, fire, flood, weather, theft or a blown fuse; using an incompatible or improperly used battery charger; a battery with broken or tampered seals, or used in equipment other than the bike it is specified for; and free gifts or included accessories such as pre-installed racks and fenders.
Shipping Damage
Shipping damage is not covered by the warranty. If you find a problem right after delivery, notify us immediately with photos and/or video of the product and damaged parts, don't use the product, and keep all original packaging.
Visit EUNORAU's Warranty Page to review the complete warranty terms.
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Shipping is typically through freight carriers and the actual shipping time is contingent on your location and the specific warehouse dispatching your order. Please allow for a 1-3 business day processing period before shipment, and an estimated delivery time of up to 7 business days. Your confirmation email will include delivery details and we will send you a tracking number as soon as one is available. If you ordered several separate items, you may receive multiple tracking numbers. Once the item has been shipped, the freight service will contact you to coordinate the date and time of delivery. If you require any special accommodations during delivery please let us know as soon as possible and let the delivery company know when arranging the appointment.
Typically, orders will be dropped off either curbside or outside your front door or garage. It is your responsibility to bring the order inside or to its final destination and to remove any existing items.
Depending on the item, parts may be shipped in multiple boxes, and assembly may be required. When your order is delivered, please check that you have all pieces of the item and that nothing is damaged. If your order is damaged during transit and external damage is visible, note the damage immediately, write it on the delivery documents, take photos and/or videos, and refuse shipment. If there is no visible external damage, accept the package but note “subject to concealed damage” on the delivery documents. Any damage upon delivery needs to be reported within 24 hours of delivery or you may not be eligible for a refund. For additional information on submitting claims, as well as incorrect item exchanges, and replacements, please see our Refund Policy.
For more information about shipping, please visit our complete Shipping Policy.
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Why Shop With Eco Emperor?
At Eco Emperor, our mission is to empower you to lead a sustainable and fun lifestyle with ease and confidence. Whether you're upgrading your outdoor experience or enhancing your eco-conscious journey, here’s why choosing us is a decision you can feel great about:
Expert and Customized Care
Our knowledgeable and friendly team is here to support you every step of the way. We pride ourselves on providing personalized service and swift responses to ensure a smooth and satisfying experience. Our dedicated team is available via phone, email, and live chat to provide you with prompt and helpful support.
Authorized Retailer of High-Quality, Trusted Products from Leading Brands
We partner with the best brands in the industry to bring you reliable, high-quality products. As authorized retailers, we guarantee authenticity and offer full manufacturer warranties on every item. You can trust that our products are built to last and perform efficiently.
Free & Fast Shipping
We know you’re eager to begin your new products or start your next outdoor adventure. That’s why we prioritize quick, reliable, and free shipping to get your orders to you on time and in perfect condition.
Competitive Pricing
We believe that sustainable living should be accessible to everyone. We offer competitive pricing on all our products, so you can enjoy high-quality eco-friendly solutions and outdoor products without breaking the bank.
Choose Eco Emperor for all your outdoor and eco-friendly product needs, and become part of a movement that’s embracing a more sustainable and adventurous lifestyle.
Thank you for supporting a greener, cleaner future, while enhancing your outdoor experiences and powering your adventures.💚
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