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I'm running 25mm tyres and on the tubes it says "18/25"; I think they're just regular inner tubes? Just really cheap I guess.
The (weird) thing is, I haven't had many flats (on the road) with them at all, maybe one. But I already had three flats while the bike was sitting stationary in my room, after not having moved for hours on end.
Tijs
@fredtc
might just be shit tubes, but are they the right size? sometimes if you but a 18-25mm tube in a 28/32mm tyre it could overstretch it and lead it to pop.