Probably a good idea to find out the correct original size I think or you could take a guess at 26 or 26.2.
Agree 26.2 likely to be correct post size. Grease well, insert and hope it holds when tightened!!!
Old tubing so roundness is relative
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Agree 26.2 likely to be correct post size. Grease well, insert and hope it holds when tightened!!!
Old tubing so roundness is relative