02 / SETUP REFERENCE
A rough front-and-rear estimate in PSI and bar. Manufacturer compatibility and pressure limits always take priority.
No recommendation for this setup: it falls outside this simple model's useful range, or exceeds the equipment maximum you entered. Use the manufacturer's setup guidance.
Check both tyre and rim minimum / maximum pressures and compatibility before inflating. A calculator result never overrides them.
Once within those limits, test small changes in a controlled setting. Bottoming out, tyre squirm or loss of control mean you should stop and reassess the setup.
These are not mountain-bike, cargo-bike or fat-bike recommendations. For high loads or unusual setups, use equipment-specific guidance.
The model raises pressure with combined rider and bike weight, lowers it with measured tyre width and rougher surfaces, and makes a small adjustment for tube setup. Front pressure is 92% of the rear estimate.
Actual weight distribution, casing stiffness, rim width and riding speed may change the right setup materially. Use this as a rough comparison, not an optimisation guarantee.
Rear PSI before rounding = [(rider + bike weight in kg) × 0.73 − (tyre width in mm − 28) × 2.4] × surface factor + setup adjustment.
Surface factors are 1.00, 0.94 and 0.88. Setup adjustments are −1 PSI for tubeless, 0 for TPU/latex and +2 for butyl. Results outside the model range are withheld rather than treated as valid recommendations.
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