jiatongdiji Durable Mountain Bike Pedal Assist System: 12 magnets for precise sensing
Available Options
Ever wish your e-bike could read your mind on a grueling climb? The Durable Mountain Bike Pedal Assist System is the tech that gets close. This sensor kit slips onto your ride, delivering buttery-smooth power boosts exactly when you need them. It’s all thanks to 12 precision magnets that track every pedal stroke, so the motor responds to your effort—not just a clunky throttle.
Built for trails and commutes, this PAS is a battery-saver’s dream. It only kicks in during pedal action, and a speed sensor keeps pace with your every move. Tough enough to laugh off off-road jolts and vibrations, it mounts simply on the crank and chainstay. The result? A ride that feels more like an extension of you—effortless, intuitive, and seriously fun.
- PAS system for electric assistance
- Speed sensor integration
- Durable construction for mountain biking
- Easy installation on ebikes
- 12 magnets for precise sensing
General specs
- Brand: jiatongdiji
- Seller: Joom
- Magnet Count: 12
- Compatibility: Ebikes, Mountain bikes
- Function: Pedal Assist System (PAS), Speed Sensing
- Installation: Crank and chainstay mount
- First listed by seller: 8/24/25
If you are interested in more details, you can find full information on the seller's page.
Shipping options
United States
Comparison with similar products
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Durable Mountain Bike Pedal Assist System Black 12 magnets for precise sensing
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Mountain Bike 12 Magnets Ebike Assistant Sensors Speed Sensor Pedal Assist PAS System
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Power Pedal Assist Sensor Dual Hall integrated
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| Brand | jiatongdiji | YajingGlass | Butterflies Worked | Good Life | Three Degrees | Sport2ZY |
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| Price | $8.85 | $9.93 | $6.92 | $6.52 | $6.81 | $16.94 |
| Seller | Joom | Joom | Joom | Joom | Joom | Joom |
| Update | August 17, 2025 | August 30, 2025 | August 26, 2025 | August 27, 2025 | August 27, 2025 | August 12, 2025 |
| Compatibility | Ebikes, Mountain bikes | Mountain bikes, Ebikes with PAS | Electric bicycles, PAS systems | 5/8/12 configurations | 5, 8, or 12 magnet setups | Electric Bikes |
| Function | Pedal Assist System (PAS), Speed Sensing | Speed sensing, Pedal assist activation | Pedal rotation detection, Speed sensing | |||
| Installation | Crank and chainstay mount | Easy to install | DIY mountable | Easy | Easy | |
Durable Mountain Bike Pedal Assist System
Emma W.
San Antonio, TX
August 31, 2025
I expected this to be just another gadget, but the reality blew me away. As someone who loves cycling, I wanted something that feels natural, and this system delivers. It reads my pedaling perfectly, giving power exactly when needed—no jerky starts or stops. It's like having an extra boost of energy on those steep hills, making my rides in San Antonio so much more enjoyable. I've been using it for a couple of months now, and it's held up great against all the bumps and vibrations. Honestly, it's made my e-bike feel like a true extension of myself. Highly recommend for any cyclist looking to make their rides easier and more fun! 😊
- Pros: The power boost is incredibly smooth and intuitive, making climbs feel effortless. It saves battery by only assisting when I pedal, and the installation was simple without any hassle. It's built tough and handles rough trails without issues.
- Cons: Could be wrong, but it might not be for everyone if they prefer a manual throttle. Sometimes I wish it had a bit more customization, but it's minor.