Brompton gear & speed comparator
Pick any two Bromptons, set their chainring, sprocket and gear, choose a cadence, and see which one rolls faster at the same pedal stroke — wheel size and all. Then watch them race.
Bike A
- Speed
- – km/h
- Wheel
- –
- Development
- – m
- Gear inches
- –″
Bike B
- Speed
- – km/h
- Wheel
- –
- Development
- – m
- Gear inches
- –″
The race
Speeds are geometric estimates (tyre squish ignored) and assume the same cadence on both bikes — illustrative, not a dyno.