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@danbarkd
So I got a slow puncture last night and had to pump up my bike this morning. I was out and didn't have time to repair the inner tube (also I didn't have all the tools with me). I just kept pumping it up. It lasted a couple of hours between 9am and 11am (of which 20mins were cycling). Then an hour on the train and it was totally flat. Then it lasted about 10 minutes a couple of times and then about 5 mins. Then, after lunch, I pumped it up and just tried to get to a bike shop to get some tyre levers and fix it... And it never went down. Been fine the last 12 hours. I'm home now and can fix it but i was wondering if this has ever happened to anyone? How can it be? Is it a valve problem?
Any ideas?