Soonaway S9Pro Electric Bike for Adults, 20"×4" Fat Tire Off-Road Ebike, 750W Rated, 25 mph, 48V20Ah, 65 mile, UL2849
Soonaway S9Pro Electric Bike for Adults, 20"×4" Fat Tire Off-Road Ebike, 750W Rated, 25 mph, 48V20Ah, 65 mile, UL2849
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Soonaway S9Pro Electric Bike for Adults, 20"×4" Fat Tire Off-Road Ebike, 750W Rated, 25 mph, 48V20Ah, 65 mile, UL2849

|17 ratings

Key item features

  • High Performance: 750W rated motor, 50 Nm torque, 25 mph top speed. Easily climbs 35° slopes for sand & mud off-road rides.
  • 48V 20Ah Removable Battery: Up to 50–65 miles in pedal-assist mode. Removable for indoor charging; built-in BMS protects battery.
  • Dual Disc Brakes & Dual Nitrogen Hydraulic Suspension: Responsive dual disc brakes. Front fork + rear nitrogen shock smooth rough trails.
  • 20"×4.0" All-Terrain Knobby Fat Tires: Strong traction, stable riding on sand, mud, snow and mountain paths.
  • Smart & Safe Riding: NFC quick unlock, LCD display for speed, mileage, battery & modes. Bright headlight for night rides.
  • Worry-Free Setup & UL2849 Safety: Alloy steel frame supports 365 lbs, fits 5'3"–6'4". Mostly pre-assembled, UL2849 certified.

Specs

Bicycle type, Mountain BikesMaximum travel distance, 65 miMaximum speed, 25 mphBattery capacity, 20 AhElectric bicycle class, Class 2Charging time, 8 hr

About this item

Product details

Soonaway S9 PRO adult electric bike delivers excellent off-road performance for outdoor enthusiasts and is suitable for teenagers aged 16 and above. Powered by a 750W rated motor, it reaches a top speed of 25 MPH and easily conquers steep slopes up to 35 degrees.
The S9 PRO electric mountain bike comes with a 48V 20Ah removable battery, providing a maximum range of 65 miles on a single charge for effortless riding on sand, mud and snow. Its alloy steel frame supports a maximum load of 365 lbs. Equipped with 20"×4.0" all-terrain knobby fat tires and dual nitrogen hydraulic suspension, it absorbs bumps for a stable and smooth ride.
This off-road electric bike features responsive front and rear disc brakes, plus a bright headlight and rear warning light to ensure safety during low-light rides. It fits riders from 5'3" to 6'4" in height and is UL2849 certified. Boasting strong traction, powerful climbing ability and great durability, it meets a wide range of outdoor riding needs.
  • High Performance: 750W rated motor, 50 Nm torque, 25 mph top speed. Easily climbs 35° slopes for sand & mud off-road rides.
  • 48V 20Ah Removable Battery: Up to 50–65 miles in pedal-assist mode. Removable for indoor charging; built-in BMS protects battery.
  • Dual Disc Brakes & Dual Nitrogen Hydraulic Suspension: Responsive dual disc brakes. Front fork + rear nitrogen shock smooth rough trails.
  • 20"×4.0" All-Terrain Knobby Fat Tires: Strong traction, stable riding on sand, mud, snow and mountain paths.
  • Smart & Safe Riding: NFC quick unlock, LCD display for speed, mileage, battery & modes. Bright headlight for night rides.
  • Worry-Free Setup & UL2849 Safety: Alloy steel frame supports 365 lbs, fits 5'3"–6'4". Mostly pre-assembled, UL2849 certified.
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Specifications

Bicycle type

Mountain Bikes

Maximum travel distance

65 mi

Maximum speed

25 mph

Battery capacity

20 Ah

Warranty

Warranty information

1-Year manufacturer warranty for the entire product. This warranty only covers manufacturing‑related defects, excluding damage from improper use, collision, modification and water immersion. 30‑day free return & exchange service

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Customer ratings & reviews

4.6 out of 5 stars
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17 ratings11 reviews
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Showing 1-3 of 11 reviews

Nov 2, 2026
Reviewer name: Customer
Top Reviewer
Sold and shipped bySoonaway Ebikes
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Love the look! A video would help assembly

I put this bike together by myself, and assembly was fairly quick once I figured out which pieces went where. The instructions are printed in color and generally easy to follow, but a few steps assumed I already knew what I was doing. I ended up asking ChatGPT for help with the parts I didn't understand. A QR code linking to an assembly video would make a big difference. My dirt bike had one, and being able to watch the steps made assembly easier. It would also give the manufacturer a way to provide updated information instead of just noting that the printed instructions might be outdated. For example, the manual mentions adjusting the saddle but doesn't explain how, so I still haven't figured that out. It also shows a three-position ignition switch, while the actual key slot only has lock and unlock positions. Clearer explanations matching the actual bike would be helpful. I really like the NFC card feature! It reminds me of the key card for my Tesla, and I like the idea of not having to carry keys for every ride. The bike looks great, especially the black-on-black finish and racing stripe, and the long saddle is really nice. I'd love to add the rear luggage rack shown in some pictures for trips to the store, but that wasn't included with mine. It was securely packaged. I did scrape an exposed part on the concrete while taking it out of the box by myself, so be mindful when unpacking an 80lb bike solo. As a bonus the small gear bag for your phone and a small bike pump is a very thoughtful inclusion and much appreciated as the tires are shipped under inflated. A few improvements to the manual would make setup smoother, but I love it so far and can't wait to take it out more often!

Incentivized Review
Helpful?63NH9JRBK5FT21279955832
Oct 25, 2026
Reviewer name: Faizi
Top Reviewer
Sold and shipped bySoonaway Ebikes
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Surprisingly Powerful Mountain Bike.

Pretty powerful mountain bike, the price is great and also it looks very nice in black color. Like moped style. Seat is super comfy. Take off is abrupt, be careful. Battery gets you far on one charge and I am very pleased with this mountain bike! Assembly was easy and straightforward and it didn't take much effort to get it ready to ride. This bike feels sturdy, well-built, heavy and reliable. It rides smoothly and has plenty of speed for an enjoyable ride without being too much. The brakes and suspension are great and work very well. I rode it for almost 60 miles yet and I don't see any loose bolt. Its 750W motor is strong enough, I highly recommend wearing a helmet and be very careful when you ride such a powerful mountain bike. I use it daily. Great value for the money!

Incentivized Review
Helpful?63NH9JRBK5FT21279955832
Oct 30, 2026
Reviewer name: Annette
Top Reviewer
Sold and shipped bySoonaway Ebikes
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Awesome ebike!!!

This ebike is very light weight. Fun and comfortable to ride! It rides great over all terrain, tested it on trails near my house and loved it. The size is perfect and assembly was easy! Battery charge and usage time was great. highly recommend!

Incentivized Review
Helpful?63NH9JRBK5FT21279955832
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