^^ This. Possibly something only just big enough to hole the tube, resulting in a pinprick hole that closes at lower pressure. That makes it a swine to find the cause. Happy hunting!Something sharp inside the tyre that's punctured the new tube too?
I'd just forget which 1 I'd used, so I always go for the start (left) of the manufacturer's name or logo. Take care not to reverse tyre or tube duringr removal or testing, too.Sounds obsessive, but alway align the tyre with the valve
For instance use one of the "1" in this picture
I was tempted to suggest "X marks the spot", but there are three of those.I'd just forget which 1 I'd used, so I always go for the start (left) of the manufacturer's name or logo. Take care not to reverse tyre or tube duringr removal or testing, too.
I was tempted to suggest "X marks the spot", but there are three of those.