What PSI for MTB?

I am still getting a lot of question about the right air pressue for a mountain bike. People follow a particular number such as a number between 35 and 45 psi. That's ok as long you understand that having a gauge is particularly beneficial even if the gauge on your pump is not calibrated. We assume that at least we are always putting the same air pressure. Here's my suggestion.

Go calibrate your gauge my putting 30 psi on your tires and going to a store and checking on an independent measuring device. Most pumps that are "cheap" will probably be 5-10 psi off from the right number. If you do have a pump that is calibrated to the exact measurement, start taking 2 psi off from the tires until you feel that the tire is too low.

WARNING:  If you are running tubeless becareful when you start approaching 25 psi and under because the front tire may burp. Also, if you are running really low psi in the rear tire and you ride in rocky and rooty trails you may damage the rims.

What do the XC World Cup racers run on their tires?
Most professional riders are running a number between 25-28 psi rear and 20-25 front. The weight of the rider definitely has to do with it as so does the terrain but this is general for most trails.

If you do decide to experiment, let me know how it goes.

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