Alrighty, I’ve just blown two tubes in half and the tire off of my rim!
The first one I think was my fault I tried to use a 19-23mm tube in a 28 conti sport.
But I nearly made my self def when the 23-28 tube blew the tire right of the rim.
According to my pump it was only at 100PSI Conti’s are rated to 116PSI, whats the chances that the pump gauge is stuffed and I’m really pumping to a much greater pressure than that?
I don’t even know how i would test it? Does anybody know of a cheap replacement pressure gauge I can rig into the existing hose?
I admit its a cheap floor pump that I have had a few years now but I hate to though shit away.
Gauge could well be wrong, 10-20% off is possible, which could take your 100 to 120. But 60-80 would be a better pressure to run.
I’d chase down a cheap handheld gauge to compare (don’t expect direct correlation, as the pressure will drop as the gauge takes some air from the tube). Or someone else’s floor pump.
Schwalbe used to have giveaway gauges, but I gave all my spares away
When you’re pumping up the tyre, is the bead on the tyre seated correctly?
And is there any visible damage to the bead of the tyre?
I’ve run 19mm tubes in 35mm tyres for a long time, and never had any issues, so I’m assuming it isn’t a tube issue.
Regardless of if the tire can take 120psi. It wont blow off for a lot more after that. Unless its stupid cheap tire, you didn’t seat it properly and now you have potentially damaged the bead.
Are you half inflating and checking the bead/round before continuing on inflating?