After a puncture and a ruined tyre I tried to put back on an old 28 inch bike tyre that WAS on the bike years ago only to find its diameter was now far to big to fit the rim....is this normal ?
- posted
5 years ago
After a puncture and a ruined tyre I tried to put back on an old 28 inch bike tyre that WAS on the bike years ago only to find its diameter was now far to big to fit the rim....is this normal ?
It's the bead that normally determines how well a tyre fits a rim and as they are normally kevlar or steel I find it had to see how it could have 'grown'?
Cheers, T i m
When the inner tube is inflated, doesn't it push the bead out into the correct location on the rim?
Nick
Did you not join the dots? Or perhaps it was caused by you tearing along the dotted line.
It may have been on that bike are you sure was it on the same (sized) wheel ? Given its possible to fit different size wheels on the same frame by way of replacements, etc.
Non folding bike tyres have a continuous wire mouded into the bead which snaps over the rim. While its conceivable that the joint in this wire may have failed that wouldn't explain why the rubber has stretched as well
michael adams
...
Hmm, either the bead wire has broken (on both sides) or you have simply mis-remembered which bike or wheel the tyre came off. My money is on the latter.
I?ve kept many old bike tyres for years and in my experience, the bead
*never* changes in size. Have you had new wheels put on at any time in the past? What size did the ruined tyre claim to be in the sidewall? What was the figure printed on the sidewall of the ?stretched? tyre?Tim
But are the rims 28inch?
Yes rubber can be like that. I have a knob on a radio here and the rubber outer is now so big I have to put tape underneath it to stop it falling off! Brian
Well they do, or at least used to when I could use a bike. Brian
Beads on older tyres were not so sophisticated. It was often just a denser rubber. Brian
Can't say it's something I've ever experienced over 50 years and many bikes (currently 10 solos between us, a cycle trailer and tandem).
Maybe I've never had a bike (or tyre) that might be likely to suffer such?
Presumably you could have a tyre come off the rim when is use then (after being on there with no issues for some time)?
Cheers, T i m
That?s nearer 26? than 28?. As I said, it?s most unlikely that the tyre changed size. Extraordinary claims need extraordinary proof. Post links to photos of what is *actually* printed on the sidewalks of your ruined and ?stretched? tyre please. Tyres just Do Not Stretch in storage.
Tim
Nor me. It just doesn?t happen. The stored tyre must have been for a different wheel.
Tim
come on tim+ where are you ......
OK down in Hawck at the moment but will do that when I get home......
yes it was totally weird and unexpected ......
This time could you manage something along the lines of a Pirelli calendar shot, it is about tyres after all?
no
Just because you had to dig the tyre out from under the cat litter, you don't have to be so negative.
yes I do ....
English "28 inch" or German "28 inch"? There's half an inch difference in the diameter of those.
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