Originally Posted by
Issaquatch
What is the rate of leakage? Are you losing 20 psi in a few hours (which would not be acceptable), or in a few days (which wouldn't be too unusual)? I've heard some people express concern about slow leaks not realizing that all tubes slowly leak air. Some are better than others even in this respect, but it really isn't a big deal if you pump up your tires before each ride.
If it's not this kind of very slow leak, there's a hole in the tube somewhere. Pump it up and stick it in a sink full of water. You'll find it.
And I suspect that multiple flats, especially with the leaking tubes (of the "wtf??!!?' variety), are due to user error.