Rider Pro and two local onboard films covering the same track layout, loaded in Tools → Onboard Studio. Use a desktop or laptop for the controls described here. Pulse telemetry is not required.
Set the common starting reference
- Position both films at the same track reference. A clearly visible line crossing can be easier to match than a rider’s movement. Use the independent positioning controls described in the video-alignment guide, accounting for different camera positions.
- Choose Set Sync. This establishes the aligned positions as the timing reference for the comparison. Check that both pictures show the intended crossing before continuing.
Measure the gap at another point
- Play both films towards your next reference and pause when the faster rider reaches it. Pick a fixed point visible in both recordings. Use the frame controls if you need to refine the crossing.
- Hold the faster film with Wait A or Wait B. Choose the control for the film that reached the reference first. That film stays at the marker while you let the slower one advance.
- Bring the slower film to the equivalent crossing, then choose Mark. Play or nudge it to the same reference. Mark the split only after checking the two positions; a different crossing point would mix an alignment error into the measurement.
- Check the new split in Sector Timing. Look for the added entry and its time difference. Repeat at further references to examine where the difference changes along the lap.
The split records the difference between reaching your chosen reference points. The panel also shows a cumulative difference. Keep those two readings distinct when deciding whether one particular section accounts for a larger gap.
Replay the marked sections together
After marking the passages you want to review, choose Replay. At the marked references, the faster film waits for the other to catch up before both continue. This brings the same part of the circuit back into both pictures as the replay progresses.
Check one of the marked crossings during replay. If the films meet at different physical points, revisit that measurement before drawing a conclusion from its time. The task is complete when the intended splits appear in the panel and replay aligns the rides at those references.
Camera angle and field of view can still make speed look different. Use the track markers for timing, then study the riding between them. The onboard-comparison article explains what those passages can reveal.