Advice please on seat post size

Archemist

Retrobike Rider
Gold Trader
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Chaps I've measured the seat tube on my alu team fox with a conventional and digital vernier

viewtopic.php?t=237708

and it comes out between 26.6 and 26.8mm which may be due to some ovalisation( :shock: ) over the years :?:

I thought it should be 27.2 (31.8 outer and ally) but there's no way a 27.2 is going to fit!

Do I go for a 26.6 or an 26.8mm and does .2mm make a difference?

Cheers :cool:
And
 
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