I'm sure I've read something about this somewhere ...
On Sunday had a flat at the start of the CTC club run - replaced the tube (brand new) and because it was cold and the rest of the chaps were itching to move on I used a CO2 cartridge - fine, instant 120psi (wearing gloves so no frozen fingers
)
... today, got the same bike out and the tyre was soft, not flat but approx 50% soft - pumped up with track pump and real air - rode 60 miles, still hard.
Is there something with CO2 that makes it reduce tyre pressure over time .. does it "shrink"?
Rob