Reference library
Published wind-tunnel CdA figures, with the speeds, yaw angles and wheels each test used. This is your starting point — WattGap refines the figure for your position and your rides, it never guesses from scratch.
Missing a bike?
Paste a link to a wind-tunnel test or type a bike name (e.g. "Cervélo S5 2025") and WattGap will search the web for its published aero figures. We review every suggestion before it joins the database.
Sign in and import rides to pre-fill these with your own averages. Compared on flat road, no wind, full-rider CdA at 88 rpm.
Loading catalog…
Click any bike for its speed/power curve and watt breakdown. Figures are published reference values under each source's test protocol — not directly comparable across different labs. CdA is measured in m²; lower is faster. Speeds converted from km/h.
Add your bike, import your rides, and WattGap learns your real CdA — then tells you which of these bikes is actually fastest for you.
Start freeLab rolling resistance (Crr) at the test pressure; lower is faster. Source: BicycleRollingResistance.com drum tests (18 mm internal rim, 28.8 km/h). Adjusted in the table above for rim width, or your measured WAM when entered (±1.5% per 2 mm of rim).
| Tire | Width | Weight | Watts / Crr by psi | Max psi | Stock on | Source |
|---|