Field experiments on your own rides — measure aerodynamic drag & rolling resistance with the Chung virtual-elevation method, or query your raw data directly.
Measure your CdA (aero drag) and Crr (rolling resistance) from a test ride — the Chung virtual-elevation method recovers them from your recorded power.
How to run a good test
- Solo. Drafting reads a false, low CdA.
- Steady power. No coasting, braking, or stops — braking sheds energy the meter can't see.
- Fast. 35+ km/h; below that, drag is too small a share of the effort to resolve.
- Varied speed. An out-and-back, or a hill both ways — one speed can't split CdA from Crr.
- One course. Repeat the same stretch; laps on different terrain won't agree.
- One position. Each position is its own setup — don't shift mid-test.
- Clean road. No junctions, traffic, or corners tight enough to brake.
Your setups
A setup is one aero configuration — bike, wheels, position, and kit sharing a single CdA and Crr. Change any of them (deeper wheels, a lower position, new tyres) and it's a new setup. ★ is the Bike Split pacing default; Make default switches it; ✕ deletes.
Test ride
Search your whole history by name or year — not just recent rides.
Conditions
Assumes calm air — the most reliable field result. The ride's estimated wind is shown below; apply it only if it was genuinely windy (a weather-model average is often wrong at road level). Mass = your weight + the setup's bike weight.
Tag your laps
Assign each test lap to a setup; leave the rest blank. Drag across the graph to zoom in (dense rides), double-click to add a split; type a lap's Start/End to nudge a split, or ✕ to remove it. Hover a row to highlight it.
| Lap | Start | End | Avg power | Avg speed | Setup |
|---|
No laps on this ride — mark them with your head-unit lap button, or add splits on the ride page, then come back.