August 17, 201610 yr To get the pressure you want, you pump the tyre up above what you want (with whatever source of compressed air you have) and then let air out until it is down to the pressure you want. If you are a novice at setting trials tyre pressure, use a low pressure (trials) gauge to measure the pressure. Once you have done it enough times, the gauge becomes unnecessary because you will be able to judge when the pressure is right by the appearance of the tyre when you put your weight on the bike, or by pushing against the tread with your knee Be aware that the tyre pressure will change with the temperature of the tyre, and with change in altitude always use a gauge (good quality low pressure one) and check a few times and go with the average or until you get repeatability. Check when you unload the bike and just before you start and even after first lap - especially on a warm day. Avoid parking the bike in the sun and then checking tyres or you will run the risk of letting too much air out
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