Bike Tire Pressure Calculator
Estimate a sensible starting front and rear pressure from your weight, tire width, and surface — then fine-tune by feel.
This is a planning aid, not a manufacturer specification. Always stay within the minimum and maximum pressures printed on your tire's sidewall and rim, and adjust for how the bike feels on the day.
Suggested starting pressure
Start here, then adjust in ~3–5 psi steps: drop pressure for more grip and comfort on rough ground, add pressure if the tire feels vague in corners or you're at risk of pinch flats.
How this calculator works
Recommended pressure follows a transparent "tire-drop" model: pressure rises with the load each wheel carries and falls as the tire gets wider, with reductions for rough surfaces and tubeless setups (which resist pinch flats at lower pressure).
- Inputs & units: system weight (kg or lb), tire width (mm), surface, tubeless (yes/no), optional sidewall max (psi).
- Weight split: the rear wheel carries more load than the front, so it gets a slightly higher pressure.
- Safe limits: results are clamped to a conservative range and never exceed your entered sidewall maximum. Output is shown in both psi and bar.
- Assumptions & limitations: coefficients are calibrated to common published road anchor points and are a starting point only — rim internal width, temperature, and personal preference all matter. The full model is documented in our calculator methodology notes.
Want to go deeper? Read the tire pressure guide for how surface, weather, and race distance change the number.
You'll need an accurate gauge
Floor pumps and gauges vary by several psi — a reliable gauge or a track pump with a clear dial makes these numbers meaningful.
Browse floor pumps with gaugesAffiliate disclosure: links may earn us a commission at no extra cost to you. These are research-based suggestions, not first-hand tests.
Frequently Asked Questions
What tire pressure should I run on my road bike?
For a typical 75–80 kg system on 28 mm smooth-road tires, a starting point is roughly the mid-60s psi front and low-70s psi rear, then adjust by feel. Heavier riders and narrower tires need more pressure; wider tires, rough surfaces, and tubeless setups allow less. Always stay within the sidewall's printed range.
Should front and rear tire pressure be the same?
No — the rear wheel carries more of your weight, so it usually runs a little higher than the front (often 5–10%). Running the front slightly softer improves grip and comfort without much rolling-resistance penalty.
Does tubeless let me run lower pressure?
Yes. Without an inner tube there's no pinch-flat risk from the tube, so tubeless tires can safely run several psi lower for more grip and comfort — this calculator reduces the recommendation when you select tubeless.
Is this calculator a substitute for the sidewall rating?
No. It's a planning aid to find a sensible starting point. The minimum and maximum pressures printed on your tire and rim always take priority — never inflate beyond the stated maximum.
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