PRECISION COACHING · TRAINING TOOLS

Tyre Pressure Calculator

Estimate front and rear road-tyre pressures from your total weight, wheel loads and measured tyre widths.

Weight units

Pressure units

01 Rider & bike

Rider weight (kg)Bike weight (kg)

Clothing, bottles & kit (kg)Anything not already included in rider or bike weight.Weight on the front wheel (%)45% is an example, not a bike-fit measurement. Use measured wheel loads for a better estimate.

How do I measure wheel loads?

With a helper supporting you, sit in your normal riding position. Put one wheel on a scale and the other on an equal-height support. Measure each wheel. Front share = front load ÷ combined load × 100.

Your wheelset OptionalUse wheelset-specific specifications and guidance

Leave this off for general advice. 232 model and generation entries from 15 manufacturers are available. Missing specifications require manual confirmation. Match the exact model and rim generation; a brand name alone is not enough.

02 Tyres & rims

For road and triathlon tyres measuring 20–37 mm. Measure the inflated tyre on your wheel; its actual width can differ from the sidewall label.

Measured front tyre width (mm)Measured rear tyre width (mm)

Internal rim width (mm)Used for a basic width check. Manufacturer approval is still needed.Rim type

03 Road conditionsRoad surface

Weather / road moisture

Typical / mixed tarmac: rough sections can favour lower pressure. Fine-tune in small steps within the tyre and rim limits; avoid bouncing or tyre squirm.

These choices tailor the riding advice. They do not automatically change the reference pressure: there is no verified universal surface or wet-weather correction in this model.

04 Equipment limits

Optional: enter the higher minimum and lower maximum from your tyre and rim specifications. Leave unknown limits blank.

Front wheel

Front minimum (psi)Front maximum (psi)

Rear wheel

Rear minimum (psi)Rear maximum (psi)

PRECISION COACHING · BIKE SETUP

Set up your next ride

Front tyre—PSI / bar

Rear tyre—PSI / bar

Enter your actual setup to find an initial pressure for each wheel. The example weights and widths are editable.

Our method & industry sources

Precision Coaching’s model estimates road-tyre pressure from wheel load and measured width. It interpolates published 15% tyre-drop reference points, using a linear load relationship and inverse-square width interpolation. It is our approximation, not a guarantee of the fastest pressure.

The calculation supports 20–37 mm tyres and 30–70 kg per wheel. It does not model temperature, speed, casing construction or suspension losses. Those factors affect real-world performance, so the selected road conditions tailor the advice rather than apply an unvalidated percentage correction. Cobbles and off-road setups do not receive a numerical recommendation.

Technical basis: Bicycle Quarterly / Frank Berto tyre-drop data. Background: SRAM/Zipp research on pressure and road losses. Equipment guidance: Schwalbe hookless requirements.

Fine-tuning your pressure

Use a reliable gauge with cold tyres. Try small changes on a familiar route, considering comfort, grip and handling. Rough surfaces can favour lower pressures, but avoid tyre squirm, rim strikes and air loss. Manufacturer limits take priority.

Modern tubeless systems and different casings can behave differently from this reference model. Use your tyre or wheel manufacturer’s model-specific recommendation where available, and discuss your setup with your coach.