Beads on older tyres were not so sophisticated. It was often just a denser
rubber.
Brian

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"Jim GM4DHJ ..." wrote in message
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"Nick Odell" wrote in message
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On 18/10/2018 11:36, Jim GM4DHJ ... wrote:
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 ?


When the inner tube is inflated, doesn't it push the bead out into the
correct location on the rim?

Nick

no that was the strange thing...it was far to large a diameter to even
come near the rim with the tube inflated.....never mind it is in the bin
now..........