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

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"Jim GM4DHJ ..." wrote in message
...
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 ?