Originally Posted by
solveg
I was taking a bicycle maintenance class, and the first thing we did was learn how to swap tubes. I decided to get new tires for my 81 SR at the same time and had the teacher help me pick them. They are wider than my old one. I have the numbers, if it's important.
Anyway, the fit of the new tires was a lot tighter. He helped me get the last hard bit in. I saved the other tire to put on at home, but never got to it. Didn't ride or touch the bike. Next week when I went in, the bead had popped out in one spot.
He was surprised, and said, "that's the one we did together, right?"
So now I'm a little freaked about it. Should I just chalk it up as an anomoly, or is it a sign of something being awry?
I had this happen the other day when airing up a wide 32c tire on a narrow 15mm (internal width) rim. That combination just barely squeaks in to the allowed category on Sheldon's tire/rim chart. Anyway, just as I had finished airing the tire up I heard it make a creaking/popping sound as it was coming off the rim so I quickly deflated it before it had a chance to blow all the way off and ruin the tube.
The next time I paid even more attention to make sure the bead was seated evenly all around the tire as I added air a little bit at a time, then I let both new tires sit for a day before taking the bike for a short ride. So far so good!
Question: How much air did you put in the tire? If your rims are old enough they may not have a hooked lip on the inside of the rim to capture the bead. They very well may be straight sided. If that's the case then you shouldn't exceed much over 70lbs of air pressure.