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  • All you need is the Topeak PanoBike app on your smartphone, which uses the iPhone's built-in GPS and accelerometers to trace your route and measure gradient and altitude
  • This accessory allows a very precise measurement of speed and cadence in real time, or it can record ride info without the phone present and sync with it later
  • Speed and Cadence Bike Sensor attaches easily on your chainstay or seatstay without scratching the finish
  • Bluetooth Smart algorithm extends battery time up to 1800 hrs. (5 years if you work out for 1 hr. per day) on the single included CR2032 battery
  • Optional accessories include the Topeak PanoBike Heart Rate Monitor and the Topeak PanoBike Mobile Power Pack, sold separately
  • Works with iPhone 4S/5 and iPod Touch with BLE 4.0


View all Topeak Cycling Computers

REI membership


Best Use Cycling
Batteries CR2032
Wireless Yes

The REI Difference

100% satisfaction guaranteed

We stand behind everything we sell. If you are not satisfied with your REI purchase, you can return it for a replacement or refund within one year of purchase.

REI's guarantee doesn't cover ordinary wear and tear or damage caused by improper use or accidents.

If your item has a manufacturing defect in its materials or workmanship, you can return it at any time. See our limited warranty.

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At REI, we live and breathe the outdoors, and we're passionate about sharing our expertise with people of all skill levels. Whether you're new to the outdoors or a seasoned explorer, we'll take the time to understand your needs and help you find the right gear for you.

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*10% is typical but not guaranteed. Your refund is based on eligible purchases, which exclude REI gift cards, services, fees, REI Adventures trips, REI Garage, and discounted items. Learn more