Try to maintain the correct inflation pressure in your tube to lower the risk of punctures. Look at the inflation recommendations marked on the sidewall of your tyre and pump your tube to the pressure within that range.
If you are aiming for speed, you can inflate your tube right up to the maximum PSI indicated as that will help to reduce the rolling resistance of the tyre.
For better grip, you can let out some air for a more comfortable ride, especially when it is raining. Remember not go below the minimum PSI range recommended as the inner tube can get pinched between the rim and the tyre which can cause punctures.
If you enjoy riding your fixie downhill, during descents, use your brakes in an on-and-off fashion to prevent the rim from been heated up as that could expand the air in your tube and cause a tyre blow-off. That is a good reason not to over inflate your tube.
If you visit Schwalbe’s website, you will find a tyre pressure chart calculated based on body weight.
Some companies supply their pumps with a PSI chart attached. So, for fixie tyre of size 700x28C, if you can’t read the markings on your tyre, it is safe to pump your tube right up to 73 PSI .
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