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1

I'm always worried about pinching my tubes when installing them, I've done it loads of times, especially when installing really tight tires. You can pinch a tube just enough to get a slow leak, so you're right to wonder if that's a probable cause. It could also be the valve as @Blam suggests, especially if it's a schrader valve tube (same valve type as ...


2

I would more suspect a leaking valve. If you pinch the tube putting it in then it is typically not a slow leak. If the valve is removable the pull it and look for any debris or defect on the seat. I had a set of cheap tubes that had like 1/2 loose valves. Remove it with pressure in the tire to blow out debris you cannot get to.



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