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Old 11-30-21, 03:56 PM
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Tubeless tire pressure problem


I have a new Giant Propel with tubeless (hookless) wheels. Based on the tire width (25mm) and my weight, the optimal tire pressure should be around 83 PSI or 5.7 bar.

I completely let the air out from both tires and started to inflate them with my existing pump (valve is at 90 degrees, so that the sealant does not block anything). However, as the pump gauge shows only around 40 PSI or 3 bar, both tires are already firm and it is hard to get any more air in them.

Thinking that the gauge of my pump is completely damaged, I have bought a new higher quality pump (Crankbrothers). However, the issue is the same: the gauge shows around 50% of the suggested tire pressure, though the tires are already firmů So the problem is probably not with the pumps.

Apologies if I am doing a basic mistake, but I cannot figure out the cause of the problem. Unfortunately I do not have an electronic pressure tester to doublecheck the values.

Any idea behind this mistery?

Last edited by horinorbi1993; 11-30-21 at 04:00 PM.
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