I thought I had a slow puncture, but the air loss wasn’t coming from my tyre?
I had just pumped up my tire and disconnected the foot pump. When I noticed there was air escaping? I placed my finger over the end of the valve and could hear the change in noise (from the escaping air). On closer inspection, I found that the valve was leaking.
It’s actually quite easy to replace a valve core. This video will show you how…
More detailed information can be found on this page: How to Replace a Wheel Valve: (Opens in a new window / tab)