Tyre pressure calculator
This bike tyre pressure calculator gives a starting-point front and rear pressure from your rider and bike weight and tyre width, in both psi and bar. Enter your total system weight split as rider and bike, your tyre width, and whether you run tubeless, and get a rule-of-thumb pressure to start from before adjusting to feel and road conditions on your next ride.
Front tyre pressure
69.9psi
Starting point — adjust for feel and conditions.
How it works
Wider tyres need less pressure to support the same weight without excessive rolling resistance or the rim bottoming out on impacts, which is why the calculator scales pressure down as width goes up, in line with the general shape of published tyre pressure charts.
System weight, rider plus bike, sets the baseline: a heavier system needs more pressure to avoid the rim striking the road on bumps, so the calculator computes rear pressure from that weight and sets front pressure about 10% lower, reflecting a typical riding position with more weight over the rear wheel.
Tubeless setups can run several psi lower than a tubed tyre at the same width and weight, since there's no tube to pinch-flat, so the calculator applies a small reduction when tubeless is selected.
Frequently asked questions
What tyre pressure should I run on a road bike?
It depends heavily on tyre width and total rider and bike weight, typically somewhere between 60 and 100 psi for common 25 to 32 mm road tyres. This calculator gives a starting figure from your specific numbers rather than a single generic rule.
Does tubeless let me run lower tyre pressure?
Yes, because there's no inner tube to pinch between the rim and an obstacle, tubeless setups commonly run a few psi lower than the equivalent tubed tyre at the same width and weight, improving comfort and grip without a flat risk from pinching.
Is this pressure calculator exact for my bike?
No, it's a rule-of-thumb starting point based on weight and tyre width alone, not rim width, road surface, riding style or personal comfort preference. Use it as a baseline, then adjust up or down in small steps based on how the ride feels.
Related tools
- FTP zones calculatorCalculate your cycling FTP from a known value or a 20-minute power, free, with the seven Coggan training zones in watts.
- Watts per kg calculatorWork out your cycling power-to-weight ratio and rider category for free, using the Coggan power profile for men and women.
- Speed to power calculatorEstimate the power needed to hold a cycling speed, free, with gravity, rolling and aero components and a full speed table.
- Climb time calculatorPredict climb time, speed and VAM from length, elevation gain and power, free, with a table across a range of power outputs.
These values are training estimates. They are not medical advice.
Overload keeps your ride notes
Overload keeps tyre pressure and setup notes attached to your rides, so your dialed-in settings are never lost. Free on iOS and Android.