Butterflies Worked Magnetic Speed Sensor for Electric Bike: Magnetic speed detection for PAS
Available Options
5 Pack
Joom
$7.12
Available to order
Picture this: you're pedaling up a steep hill, and your e-bike's motor kicks in seamlessly, matching your effort without a hitch—that's the magic of a magnetic speed sensor. This little gadget is the unsung hero of electric bicycles, enabling the Pedal Assist System (PAS) by detecting pedal or wheel rotation through magnetic fields. It translates your pedaling into smooth, proportional motor assistance, turning grueling climbs into breezy ascents and making long rides feel effortless. Whether you're converting a standard bike into an e-bike or upgrading an existing setup, it's a game-changer for efficiency and comfort. Installation is a breeze: just mount it near the crank or wheel hub, wire it to the controller, and you're good to go. Compatible with most e-bike systems, it's a versatile pick for DIY tinkerers and pros alike. Beyond the smoother ride, it helps conserve battery by only assisting when you pedal, and it keeps you on the right side of the law—many regions mandate pedal assist for e-bikes to hit the bike paths legally. In short, it's the smart upgrade that makes every ride feel more natural and a whole lot easier.
- Easy installation on bicycles
- Compatible with various e-bike systems
- Enables pedal assist functionality
- Durable and reliable sensor design
- Magnetic speed detection for PAS
General specs
- Brand: Butterflies Worked
- Seller: Joom
- Type: Magnetic Speed Sensor
- Compatibility: Electric bicycles, PAS systems
- Installation: DIY mountable
- Function: Pedal rotation detection, Speed sensing
- First listed by seller: 8/29/25
If you are interested in more details, you can find full information on the seller's page.
View on seller's site
#publicidad
$7.12
Last price update: 8/29/25
Available to order
Shipping options
Delivery to 
United States
United States
Unavailable
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| Brand | Butterflies Worked | Three Degrees | Good Life | YajingGlass | Fishine | Mndhfjk2 |
| Model | E bike PAS System Assistant Speed Sensor | |||||
| Color | ||||||
| Rating |
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| Price | $7.12 | $7.01 | $6.70 | $10.21 | $7.75 | $11.81 |
| Seller | Joom | Joom | Joom | Joom | Joom | Joom |
| Update | August 26, 2025 | August 27, 2025 | August 27, 2025 | August 30, 2025 | August 30, 2025 | August 18, 2025 |
| Compatibility | Electric bicycles, PAS systems | 5, 8, or 12 magnet setups | 5/8/12 configurations | Mountain bikes, Ebikes with PAS | Most electric bikes | Most traditional bicycles |
| Installation | DIY mountable | Easy | Easy | Easy to install | Easy | |
Magnetic Speed Sensor for Electric Bike
$7.12
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