Contact Patch Inflator

Bright engineering concern

About this app

Contact Patch Inflator works out separate front and rear bicycle tyre pressures from a constant tyre-drop model, and draws the contact patch to scale so you can see what the numbers mean.

HOW IT WORKS
Enter rider, bike and luggage weight, and the load is split front and rear according to your bike type. Then set tyre width, wheel size by ETRTO bead seat, inner rim width, tubeless or tube, and the tyre's max rating. The model picks the pressure that gives each wheel about a 15 percent tyre drop, then corrects it for surface, riding style and tubeless.

SAFE BY DESIGN
A minimum safe pressure guard and the tyre's max rating clamp every result, and plain-language checks explain what is going on.

SEE YOUR TYRE
The tyre cross-section on its rim and the front and rear footprints are drawn live as you change inputs.

KEY FEATURES
- Separate front and rear pressures in psi or bar from a constant tyre-drop model
- Accounts for bike type weight split, tyre width, ETRTO wheel size and inner rim width
- Surface, riding style and tubeless corrections with a minimum safe pressure guard
- Live tyre cross-section and to-scale contact patch drawings
- Compare smooth, rough, gravel and wet surfaces in one glance
- Saved setups in a garage and a ride log with feel notes and suggested adjustments

PRIVATE AND QUIET
Contact Patch Inflator is fully offline and needs no internet connection. No ads, no accounts, no sound. Your setups and ride log stay on your device.

What’s new

Contact Patch Inflator