Machining a seatpost to fit

kellyjk · Oct 21, 2012

Has anyone reduced the outside diameter of a donor seatpost for a project that had an unusual size? If so please give me some pointers for a project like this Thanks John

fettler · Oct 25, 2012

Seatpost

I`ve taken a post from 27.2 to 26.8 before. Only a cheapy post with plenty of wall thickness mind you. Lightweight posts are a different territory as they`ll probably break if you take off more than a whisker. If you have access to a lathe its an easy task, about 15-20mins work although a machine shop would probably charge you the price of a decent post to do it.

Is it a type of post you want to stay with or is the frame a weird size?

kellyjk · Oct 26, 2012

machined post

Yes it is specific. I want a syncros post and the size is a 26.4. This I"m beginning to believe will be a hard post to find

jmgk · Oct 28, 2012

You could get the frame reamed out a bit too. Why not? Meet halfway!

poweredbypies · Oct 28, 2012

Or shim a smaller post up which would be a safer and easier option.

jmgk · Oct 28, 2012

poweredbypies":1ngo2o23 said:
Or shim a smaller post up which would be a safer and easier option.

Sissy

poweredbypies · Oct 28, 2012

jmgk":wssb7xnz said:
poweredbypies":wssb7xnz said:

Or shim a smaller post up which would be a safer and easier option.

Click to expand...

Sissy

yeah but a sissy without half a seatpost up my jacksie

fettler · Oct 31, 2012

post

I waited for ages for a syncros in 27.0 then saw 3 in the space of a few weeks. I don`t know if syncros had custom drawn tubing for each diameter or every few diameters. Maybe there`s enough wall thickness in a 26.8 to machine away which is a more common size. I`d be willing to compare the wall thickness from my syncros 27.0 if anyone can quote the wall thickness of a 27.2 or 26.8 ???

Machining a seatpost to fit

kellyjk

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fettler

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kellyjk

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jmgk

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poweredbypies

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