Go faster on the same watts.

What it measures

• Crr — rolling resistance. Compare tyres, pressures, and surfaces.
• CdA — aerodynamic drag. Test riding positions and kit with a full ride or a dedicated roll-down.
• Power, heart rate, cadence, laps, elevation and a GPS route, captured for every ride.

How it works

Record a ride with a power meter and GPS. On the phone, the app fits Crr and CdA from your power, speed, and gradient with a least-squares physics model — no lab, no wind tunnel.

Upload a ride and it gets a private, shareable web page — route, metrics, and the Crr/CdA fit — exactly like the ones this site serves.

Get the app

GOTTA.BIKE: FAST is available for iOS and Android, currently in beta. Once you've recorded and uploaded a ride, open your rides on the web with the link in the app's Settings.

Contact

Questions, feedback, or want in on the beta? Get in touch.