Paceline Replay

Drop each rider's file from one paceline session and watch it back: who was on the front, who swung off, who got back on.

Your files never leave this device. The replay is built here in your browser; nothing is uploaded or stored, and this site can't send your data anywhere.

Drop riders' files here, or click to choose .tcx or .gpx, one per rider, all from the same session. Each rider is labelled from their file name: AB.tcx → AB, Sam Rider.tcx → SR.

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How it works, and its limits

Each file's clock is lined up from its GPS (a file with a wrong start time is fine), turns are found from power, and the order of the line follows how a paceline rotates: whoever swings off goes to the back. Swinging off and getting back on are modelled from power, not measured. It's built for velodromes and other closed loops. A replay is one self-contained file: download it to keep it or send it to the others.