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But it feels like it rapidly loses pressure as I ride.
Do they actually lose pressure? Or are you freaking out because they feel different to butyl?
It's easy to test.
If they're losing more than ~10psi* a day then perhaps you've got a dodgy/leaky valve (or two) which is unlucky but not unheard of. It happens with butyl tubes too.
*maybe 20psi a day if you're heavy/loaded/doing-mega-miles on small tyres.
miro_o
@JB
Interesting. I'll give that a go. Thanks.
Thanks Miro, I've been dong that - sorry that's what I meant by I've kept my rear tyre at 90psi. I've been inflating it every day. But it feels like it rapidly loses pressure as I ride. So much so that I'm super careful about riding over bumpy sections of road and trying not to put weight on the back of the bike - less than ideal.