Here’s what Peter offered for anyone wondering. Presumable 28.6 is top tube diameter and 31.8 is down tube/sea tube?
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The 28.6 will be the seattube, 28.6 - 0.8 x2 = 27.0 seatpost or ream it out a bit for 27.2mm.
@Batman started
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Here’s what Peter offered for anyone wondering. Presumable 28.6 is top tube diameter and 31.8 is down tube/sea tube?
1 Attachment