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My experience is that leaks around the valve hole are caused by poorly seated rim tape.
When putting rim tape on it’s good to get it warm so the sticky stuff is tacky and the tape a little bit more elastic and stretchy. Put tyre on and inflate with inner tube to get tape properly seated.
When putting valve in make a small hole with two cuts to make an x.
dancing james
Bloody hunts leaking air out around the valve hole - I e just re-done rim tape but the seal is terrible. It was working before! Can't get the tyre to pop even using an airshot and have tried a few times, getting tired / annoyed.
Any quick fixes for getting a better seal around the valve?