BMX Guide
BMX Tyre Pressure
BMX tyre pressure usually runs from about 40 to 100 PSI depending on discipline and rider weight, and must always stay within the range printed on the sidewall.
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Most BMX tyres run between about 40 and 100 PSI, depending on the discipline, your weight and the surface. Street and park riders usually run about 60 to 100 PSI, dirt jumpers about 40 to 65 PSI, and racers somewhere within the tyre's range. The final number must always sit inside the minimum and maximum printed on the tyre sidewall. Lower pressure gives more grip. Higher pressure rolls faster and protects the rim.
PSI by discipline
| Discipline | Typical PSI | kPa (approx) | Bar (approx) | Why |
|---|---|---|---|---|
| Street | About 60 to 100 | 415 to 690 | 4.1 to 6.9 | Lower absorbs drops; higher protects rims on ledge hits |
| Park | About 60 to 100 | 415 to 690 | 4.1 to 6.9 | Firmer for fast, smooth transitions |
| Dirt jumping | About 40 to 65 | 275 to 450 | 2.8 to 4.5 | Lower for grip on loose dirt |
| Racing | About 60 to 100, within the tyre range | Check the tyre | Check the tyre | Less rolling resistance on a firm track |
| Flatland | Often near the tyre maximum | Check the tyre | Check the tyre | A hard tyre makes spins and balance easier |
These are starting points. Riders disagree, and conditions change. Many 20 inch tyres are rated to 100 PSI and some low-pressure versions only to 65 PSI, so the sidewall always wins.
The printed range
Every tyre has a minimum and maximum pressure moulded into the sidewall. Treat these as hard limits.
- Below the minimum: the tyre can squash flat on landings, pinch the tube against the rim (a pinch flat) or roll off the rim in a hard corner.
- Above the maximum: the tyre may fail, the bead can blow off the rim, and you lose grip.
If a tyre lists "65 to 100 PSI", pick a number in that range, not outside it. If the pressure you want falls outside the range, change the tyre rather than ignore the printing. See tyres.
Rider weight
Heavier riders need more pressure to protect the rim and avoid pinch flats. Lighter riders can run lower pressure for more grip.
| Rider weight | Suggested approach |
|---|---|
| Under about 60 kg | Middle to lower end of the range |
| About 60 to 80 kg | Middle of the range |
| Over about 80 kg | Middle to upper end of the range |
These are rough guides, not hard rules. Adjust a few PSI at a time and ride on the new pressure before changing again.
Rim damage and pinch flats
Low pressure is the main cause of dented rims on BMX bikes. On a hard landing, a soft tyre compresses fully, and the rim hits the ground or an edge. That dent can be hard to fix and may cause a wobble. Rear tyres take most of the impact, so many riders run the rear a few PSI higher than the front.
If you flat often or dent rims, add 5 to 10 PSI and see if it helps. Make sure you stay inside the printed range.
How to set your pressure
- Read the sidewall. Find the minimum and maximum PSI printed on the tyre.
- Use a pump with a gauge. Cheap pumps without a gauge are often wildly wrong. A gauge makes your pressure repeatable.
- Start in the middle of the range. Pump to that number.
- Ride a short loop. Pay attention to grip, bounce and how the rim feels on small hits.
- Adjust in 3 to 5 PSI steps. Lower for more grip and comfort. Higher for speed and rim protection.
- Recheck weekly. Tubes and tyres leak a little each day. Add air before each session.
Common mistakes
- Running very low pressure to get "more grip" on smooth concrete. It mostly gets you dented rims.
- Ignoring the sidewall maximum because a friend runs higher.
- Using a petrol station gauge, which is often inaccurate for small tyres.
- Running the same pressure for every surface. A rough park or a wet day may want a small change.
Tyre width matters
A narrower tyre needs more air to carry the same load. A wider tyre can run lower pressure. If you swap to a different tyre width, start over in the middle of its printed range. See BMX maintenance basics for the rest of your weekly checks.
Related
Frequently asked questions about BMX Tyre Pressure
What PSI should BMX tyres be?
Street and park riders commonly run about 60 to 100 PSI, dirt jumpers about 40 to 65 PSI, and racers somewhere in the tyre's range. Many 20 inch tyres are rated to 100 PSI and some low-pressure versions only to 65 PSI. Always stay within the range printed on the tyre sidewall.
Can I run lower pressure than the printed minimum?
It is not recommended. Pressure below the minimum can cause pinch flats, dented rims and the tyre rolling off the rim in corners.
How often should I check tyre pressure?
Before each session, or at least weekly. Tyres lose air slowly, and a few PSI drop can change how the bike feels and how easily a flat happens.
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