Eunorau SPECTER-S 4.0 / Hunter X9

Key Features

Power the Climb. Control the Descent.

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. Add an SRAM NX 11-speed drivetrain and four-piston hydraulic brakes, and the SPECTER-S 4.0 is ready for confident exploration beyond smooth pavement.

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.

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.

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.

48V 17.5Ah Removable Battery

The removable downtube battery uses LG cells. 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.

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.

Take A Closer Look

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.

FOUR-PISTON HYDRAULIC BRAKES

Front and rear HD-E620 four-piston hydraulic brakes use 180mm rotors for controlled stopping performance.

SRAM NX 11-SPEED

An 11–42T cassette provides a practical range of gears for climbs, cruising, and changing terrain.

BAFANG HANDLEBAR DISPLAY

The DP C018.CB display keeps essential riding information and assist controls within easy reach.

ALUMINUM REAR RACK

The included rear rack adds a practical carrying platform for compatible bags and cargo accessories.

EUNORAU COMFORT C7 SADDLE

The wide, contoured C7 saddle provides supportive comfort for daily commuting and relaxed weekend rides.

Dimensions & Rider Fit

Unboxing & Assembly

Note: This video is for a previous version of the Specter-S.

Review Videos

Note: These videos are for a previous version of the Specter-S.

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 feature: Type-C output

Performance

• 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
• 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: 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
• 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