Originally Posted by
masi61
If they have a removable valve core can you tighten up the valve core? It helps to have a valve core tool for this or you can use parallel jaw pliers or small vise grips for this.
When I needed to loosen one while out on a ride I found that a spoke spanner fitted. Which I was very pleased about as, otherwise, I was looking at deliberately puncturing the tube to get it to deflate.