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Tubeless vs. tubes: tire pressure
Tubeless lets you run lower pressure than inner tubes, but not by as much as people often claim. Here’s how big the difference really is and where it comes from.
Tubeless: 3–10% lower pressure
Compared with butyl tubes, about 5% on a road bike, 7% on a gravel bike and 10% on an MTB. Latex and TPU tubes sit in between.
The difference in numbers
Same rider, same tires, only the system changes:
| Tubeless | Latex / TPU | Butyl | |
|---|---|---|---|
| Road, 28 mm | 58 / 67 | 60 / 69 | 61 / 70 |
| Gravel, 40 mm | 33 / 37 | 35 / 39 | 36 / 40 |
| MTB, 2.4″ | 22 / 24 | 23 / 25 | 24 / 26 |
Calculated with the TireDial model: 70 kg (154 lb) rider, typical bike, default surface, dry.
Why tubes need more pressure
The reason isn’t rolling resistance, it’s the pinch flat. When the tire hits an edge it gets compressed all the way to the rim. With a tube inside, the tube gets pinched between the tire and the rim wall and gets two small holes: the “snakebite”. The only defense is enough pressure in reserve.
Tubeless tires have no tube to pinch. You can choose the pressure that’s best for grip, comfort and rolling resistance, without a safety margin on top.
Off-road the difference is bigger because pinch flats are far more common there. That’s why the margin on an MTB is twice what it is on a road bike.
Butyl, latex or TPU?
Butyl is the standard tube: cheap, tough and it holds air well. But it’s relatively stiff and rolls noticeably slower.
Latex is very supple and rolls almost as fast as tubeless. It handles impacts a bit better than butyl but loses air quickly: check your pressure before every ride.
TPU tubes are very light and pack tiny, ideal as a spare. Pressure-wise they behave much like latex.
Is tubeless faster?
Tubeless rolls faster than butyl and about as fast as latex. The bigger gain comes from the lower pressure: on real roads and trails an overinflated tire loses energy to vibration. And without a tube there are no pinch flats, and sealant usually plugs small punctures on its own.
What to watch out for when you go tubeless
- Don’t go too low: tubeless has a lower limit too. If the pressure is too low the tire “burps”: it briefly lifts off the rim under hard cornering and loses air and sealant. Hard hits can also damage the rim.
- Top up sealant: it dries out after a few months, depending on the climate.
- Mind the maximum: tubeless tires and especially hookless rims often have lower limits than tires with tubes.
- Carry a spare tube: for big cuts the sealant can’t close. Then add the tube margin to your pressure.
Your exact pressure in seconds. TireDial uses your weight, tires and rims, tubeless or tubes, surface and wet conditions, front and rear separately, and always respects your maximum pressure. Free for iPhone.
FAQ
How much lower pressure can I run tubeless?
Compared with butyl tubes, about 5% on a road bike, 7% on a gravel bike and 10% on an MTB. A road tire at 70 PSI with a tube is about 67 PSI tubeless.
Why do inner tubes need more air pressure?
To avoid pinch flats (snakebites), where the tube gets pinched between the tire and the rim. Tubeless tires can’t flat that way.
Do latex and TPU tubes need less pressure than butyl?
Slightly, yes. In the TireDial model they sit between tubeless and butyl: about 3% (road) to 6% (MTB) above tubeless.
What happens if tubeless pressure is too low?
The tire can “burp” in corners, briefly lifting off the rim and losing air. Hard impacts can also damage the rim.
Keep reading
TireDial’s values and the ones on this page are well-founded starting points, not manufacturer specifications. Always stay within your tire and rim limits. See also the safety notice.