Slowest of slow punctures?
For around a month now my front tyre has been deflating, but not fast enough to affect my riding in any way. Can do four hour rides with no noticeable change in tyre pressure.
When I go to get my bike out the next day, the rear tyre is still up at 100psi, yet the front is down at 20psi.
Any ideas? On removing the tube I couldn't find any puncture.