tyre pressure?

[Eden]

Sounds like it may have just been a faulty tube - pumping it up to a higher pressure made it finally go. It could also be a burr or sharp spot around the hole in the rim that the valve stem comes through. Check that if it happens again.

[BleeckerSt_Girl]

Another possibility since the tire blew around the valve is that after you inflated it you either pulled the valve up or to one side, OR you tightened the big nut that snugs the valve to the rim too tight. Any of these things will pull the valve where it meets the rubber of the tube and pull it against the sharp edge of the rim hole. Be gentle with valves- don't tilt them or pull at them with the pump head and don't over tighten that bolt that holds the valve to the rim.

I'm another one who always inflates to about 10 pounds LESS than the maximum stated on the tire. I think it gives me a smoother ride and less stress on the tubes.

[letsride89]

i ride at 110psi...and i love it


make sure you check your tire before inserting the new tube..

one trick BF taught me was to air up the tube a little bit until it has form...then deflate it...

then air it up for good! i think it just gives it a good stretch before putting all that psi in there...

hope it helps!

[OakLeaf]

OR you tightened the big nut that snugs the valve to the rim too tight

I don't even use those. I thought those were only needed if you wanted to put a Presta valve tube on a rim that was drilled for a Schraeder valve? And, what is the point of a valve cap on a Presta valve??

This topic was just discussed. It takes more than 10 PSI over to blow a tube. If it were overinflation that killed your tube, you'd know because it would have popped the tire off the rim. If the tire stays on the rim, the tube CAN'T blow because it can't overexpand!

Others have identified the usual suspects - a defect at the base of the valve caused by (1) abusing the tube in the rim, (2) an old dry rotted tube, or (3) least likely, a manufacturing defect. A pinch flat at the valve would be extremely unlikely, because the reinforcement around the valve prevents the tube from getting caught under the bead.

I inflate my road tires to the max. I've read that someone of my weight (122) really only needs about 80# in a road tire to prevent pinch flats, but I DEFINITELY notice the difference in rolling resistance when they're even 10 PSI under the max.

[Blueberry]

My bet is that either 1) it was a defective tube (lots of them are defective that way) or 2) you have a small burr where the valve goes through. DH went through ~5 tubes before our lbs put some duct tape around the hole. No problems since.

CA

[SouthernBelle]

I kept getting flats about an inch away from the stem and couldn't figure it out until recently. It was where the rim tape ends overlap slightly. That tiny edge was rubbing a hole in the tube. I've covered it with teflon tape.

[mimitabby]

on the wraps for some new tires I bought recently i had a chart which had recommended inflations based on MY WEIGHT. The lighter you are, the less air you need in your tires.

Ms Elephant, bummer about the tube. I think the 75psi was fine. Another possibility is that the PUMP is faulty and you actually inflated your tire to 150psi or something like THAT!

[SadieKate]

I. . . or (3) least likely, a manufacturing defect.

I no longer buy Michelin tubes because several had sudden failures at the base of the valve -- one on a front wheel on a descent. And my experience is not unique.

[uk elephant]

So I put a new tube in the tyre, and this time pumped up to 65psi. Everything seems ok. Just did 20miles and no explosions. The road definitely feels rougher with the higher pressure though. I'll give it a few days and see how it goes.

Mimi - I suppose the pump could be faulty, but I hope not. It is brand new after all. maybe I should head in to the lbs and have them check the tyre pressure just in case.