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I want to swap to another seatpost in one of my bikes to a better (and non saddle rail slipping) seatpost I have going spare
The seatpost supplied with the bike says 29.2mm on it. (Measuring with verniers gives a range of 29.2 - 29.05mm along its length, presumably wear?)
The maximum inside diameter measurement I can get from the seattube (with no clamp around it) is 29.25mm
The seatpost has never been a great fit, requiring loads of tightening at the seat QR to stop is slipping
(the OD of the seatube is 35mm, as is the ID of the clamp (both oddly not 34.9mm)
The seatpost I want to put in says 27 on it (off an '03 Marin), but on measuring is 26.9 - 26.85mm along its length. It'd fair to assume its more worn out as its been slid up/down much more
Should I be trying to work from what the components were originally? Or as they are worn now? Given I won't be moving the saddle up/down very much on this bike, should I attempt to choose a shim to create more of an interferance fit?
I haven't found a 27 - 29.2mm seatpost shim to buy, So would a 26.8 - 29mm work? Or a 27.2 - 29.4mm?
Else going off worn dimensions, a 26.8 - 29.2 (26.85mm seatpost into 29.25mm frame) might work best?
Please help