Cycling Performance Lab
Estimate segment time from power, weight, CdA and Crr.
Use average grade from a route planner.
Positive wind means headwind; negative means tailwind.
Connect to Intervals.icu to unlock Best Effort.
No data is stored on any server. Credentials saved locally, never visible.
Fetching power data...
W/kg uses body weight only. Physics uses body plus gear.
Best Effort uses a 2-parameter CP model: P(t) = CP + W' / t, capped by Pmax for very short efforts.
Lower CdA means less aero drag. It matters more at higher speed.
Choose a bike and surface preset, then fine tune Crr if needed.
Optional group riding model.
Position 1 is the front rider; higher positions receive more draft.
Remaining time is split evenly across the drafting positions.