I've noticed that my mountain bike tire looses air, not because of a leak, etc., but just naturally as time progresses.
Does anybody know the average psi loss over time for a mountain bike tire and tube?
Just the average for a 29" wheel.
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Depends on the tube, and, of course, on the pressure. With my road bike I figure to pump up my tires every 3-5 days (depending on how fussy I'm being). But some road tubes leak down substantially in 24 hours. Mtn bike tires should last a bit longer, because they're lower pressure and larger volume.– Daniel R HicksCommented May 10, 2019 at 1:46
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It would be nice if a tire or tube manufacturer provided some technical info. online about average psi reduction for a healthy tire. Would keep the guess work out of a slow leak vs. natural loss.– user39416Commented May 10, 2019 at 1:57
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Too highly variable, plus the fast leakers don't want to admit it.– Daniel R HicksCommented May 10, 2019 at 2:00
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1Varies quite a bit - not sure why but sometimes I am surprise how soft the tires have gone in a short time, other times (same bike, same wheels, same tires, same tubes) they seem to last months and are till good to ride. With a family I have 5 bikes to maintain, sometimes it feels seems I spend more timeadding air tires than riding..... If you are worried, change tubes to a different brand - stay away from light weight ones.– mattnzCommented May 10, 2019 at 3:29
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1@Carel - The Presta valve should not be screwed TOO tight. Just to where the fingers feel some resistance. If you over-tighten you deform the gasket and it's more likely to leak eventually.– Daniel R HicksCommented May 10, 2019 at 11:57
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1 Answer
Continental tire ( they make tubes as well ) states that their tubes loose about 5 psi per week and suggests topping them off on a weekly basis.
This information is not published but they will tell you as much on their support line if you speak German.
For a tube and tire combination, the tube is designed to hold the air in, not the tire and is the point of loss to consider.
