GPS Speed Tracking for Cyclists
No sensor or bike computer required — here is what to know about tracking cycling speed with GPS alone.
GPS vs. wheel sensors
A wheel speed sensor measures rotations directly and is extremely precise at a given moment, but needs calibration to wheel size and hardware installed on the bike. GPS needs no hardware at all and is accurate enough for most riders, though it can lag slightly in very tight turns or dense tree cover.
Getting a clean reading
- Mount your phone where it has a clear view of the sky, not deep in a pocket or bag
- Start tracking a few seconds before you start riding so the GPS has time to settle
- Expect small dips in accuracy under bridges, in tunnels, or on tree-lined trails
Average speed vs. max speed
Average speed is calculated over your total moving time, so stopping at lights or junctions does not unfairly drag it down if moving-time detection is used. Max speed is more sensitive to brief GPS noise — a sudden spike for one sample is usually noise, not a real speed burst.
Who this is good enough for
For casual riders and anyone without a dedicated bike computer, phone GPS is a solid, free way to track rides. Competitive cyclists chasing precise power and cadence data will still want dedicated sensors.
Try it yourself
Bike Speedometer — free, no install, works in your browser.
Frequently asked questions
Why does my max speed look too high after a ride?
A single noisy GPS sample can spike briefly — treat an isolated, unrealistic max speed as likely noise rather than a real moment.