The Big Fork Full-Suspension Powerhouse
The AOSTIR – Electric Bike S17 is a high-performance electric mountain bike designed for riders who demand serious power and comfort. The standout feature is its massive double shoulder big fork — a high-performance, shock-absorbing front suspension that delivers better handling, improved cornering, and an overall smoother ride.
1500W High-Torque Motor
A Boneng 1500W brushless rear hub motor generates 80Nm of torque for climbing steep hills and powering through rough terrain. The AOSTIR – Electric Bike S17 reaches a top speed of 30 mph (50 km/h), transforming challenging trails into effortless journeys.
48V 20Ah Samsung Battery
The AOSTIR – Electric Bike S17 is equipped with a 48V 20Ah lithium-ion battery featuring premium Samsung cells. This high-capacity battery delivers:
- 30-45 km (19-28 miles) in pure power mode
- Up to 80 km (50 miles) with pedal assist
- 4-6 hour full recharge time
Big Double Shoulder Front Fork
The signature feature of this ebike is the double shoulder big fork — a heavy-duty XCM hydraulic fork that provides exceptional front-end suspension. The AOSTIR – Electric Bike S17 floats over obstacles that would rattle standard bikes, with the big fork absorbing impacts from rocks, roots, and potholes.
Full Dual Suspension System
Unlike many fat tire ebikes, the S17 features both front and rear suspension:
This full-suspension setup ensures the AOSTIR – Electric Bike S17 keeps you comfortable on the roughest trails.
26″ x 4.0″ Fat Tires
Massive 26″ x 4.0″ fat tires provide exceptional traction on sand, snow, mud, and rocky trails. The thick tires allow the AOSTIR – Electric Bike S17 to float over soft surfaces and maintain grip in challenging off-road conditions.
Hydraulic or Mechanical Disc Brakes
Depending on the configuration, the S17 features either hydraulic disc brakes or Tektro mechanical disc brakes with 180mm front and 160mm rear rotors. The AOSTIR – Electric Bike S17 delivers reliable stopping power in wet or muddy conditions, essential for off-road safety.
7-Speed Shimano Drivetrain
A Shimano 7-speed drivetrain with Sunrace components gives you precise gear control for different terrains and inclines. The AOSTIR – Electric Bike S17 lets you find the perfect pedaling cadence whether climbing steep grades or cruising on flats.
Three Riding Modes
The S17 offers three distinct riding modes to match your needs:
- Pedal Mode – Traditional cycling without motor assistance
- Power Mode (PAS) – 5-level intelligent pedal-assist system
- Boost Mode (Throttle) – Half-twist throttle for pure electric power
Color LCD Display with USB Charging
The multifunctional color LCD display shows battery power, speed, mileage, gear, and wattage. The AOSTIR – Electric Bike S17 includes a USB port for charging your phone or GPS device — perfect for long trail rides.
6061 Aluminum Alloy Frame
The lightweight 6061 aluminum alloy frame provides durability without excessive weight. The AOSTIR – Electric Bike S17 features a long wheelbase that delivers amazing stability at high speeds.
Sizing and Payload
The S17 accommodates riders 5’4″ to 6’5″ in height with a maximum payload capacity of 300-330 lbs. Saddle height adjusts from 88-100cm (34.6-39.4 inches).
Full-Suspension Benefits
Riders report that the big front fork makes the front end “float over everything”. The long wheelbase provides exceptional high-speed stability. The AOSTIR – Electric Bike S17 is described as having a “very quiet motor” with a smooth, stable ride.
Assembly and Delivery
Assembly is 90% complete out of the box, with final assembly including the front wheel, handlebars, and pedals. Basic tools are included. The AOSTIR – Electric Bike S17 weighs approximately 84 lbs (38kg).
Who Is the S17 For?
The AOSTIR – Electric Bike S17 is perfect for:
- Off-road enthusiasts and trail riders
- Riders wanting full suspension on a fat tire ebike
- Heavy riders needing 300+ lb capacity
- Anyone who prioritizes comfort and high-speed stability
- Riders who want a powerful, stable platform for mountain trails
To protect your battery investment, read our Ebike Battery Care Guide. For routine upkeep, follow our Essential Ebike Maintenance Tips.
Pros:
- 1500W motor with 80Nm torque (30 mph top speed)
- 48V 20Ah Samsung battery (long range)
- Double shoulder big front fork (superior front suspension)
- Full dual suspension (front fork + rear spring)
- 26″ x 4.0″ fat tires for all-terrain
- Hydraulic or mechanical disc brakes (180/160mm)
- 7-speed Shimano drivetrain
- 300-330 lb payload capacity
- Color LCD display with USB charging
- 90% pre-assembled
Cons:
- Heavy at 84 lbs (38 kg)
- Rear suspension spring may be stiff
- Mixed customer reviews on quality control
- Cadence sensor (not torque sensor)
AOSTIR – Electric Bike S17 | Big Front Fork | 1500W: Technical Specifications
- Motor: 1500W Boneng brushless rear hub, 80Nm torque
- Battery: 48V 20Ah Samsung lithium-ion
- Controller: 48V 30A
- Top Speed: 30 mph (50 km/h)
- Range: 30-45 km pure power / 80 km PAS mode
- Charge Time: 4-6 hours
- Frame: 6061 aluminum alloy
- Front Fork: Double shoulder big fork / XCM hydraulic fork
- Rear Suspension: Spring shock absorption
- Brakes: Hydraulic or Tektro mechanical disc (180mm front/160mm rear)
- Gears: 7-speed Shimano/Sunrace
- Tires: 26″ x 4.0″ fat tires
- Display: Color LCD with USB port
- Throttle: Half-twist rotary
- Pedal Assist: 5-level PAS
- Riding Modes: Pedal / Boost / Power
- Lights: Front LED headlight
- Rear Rack: Not included
- Fenders: Not included
- Weight: 84 lbs (38 kg)
- Payload Capacity: 300-330 lbs
- Rider Height: 5’4″ – 6’5″
- Saddle Height: 88-100cm (34.6-39.4″)
- Colors: Blue, Red/White/Blue (American flag)
- Warranty: 1 year on all parts
Why Choose the S17 with Big Front Fork?
The AOSTIR – Electric Bike S17 stands out for its big double shoulder fork — a feature typically found on much more expensive e-mountain bikes. This heavy-duty front suspension, combined with rear spring shock absorption, creates a true full-suspension experience that keeps you comfortable on rough trails.
The 1500W motor provides class-leading power for climbing steep hills and carrying heavy loads up to 330 lbs. The 26″ x 4.0″ fat tires and long wheelbase deliver exceptional high-speed stability — riders report feeling “very very stable” at top speed.
The 48V 20Ah Samsung battery offers impressive range, with up to 80 km in pedal-assist mode. The color LCD display with USB charging keeps your devices powered on long trail rides.
Customer reviews praise the bike’s power, speed (achieving 34 mph on flat ground), and stable ride. Some users have reported quality control issues with shipping damage, making careful inspection upon delivery important.
The AOSTIR – Electric Bike S17 | Big Front Fork | 1500W is for riders who want a powerful, fully suspended fat tire ebike with premium front suspension features.
For more options, browse our Collection of Fat Tire Ebikes or read our Ebike Buying Guide to find your perfect match.
