Anyone know of a Shim/adapter to fit a round post in D shape?

Discuss light weight issues concerning road bikes & parts.
Posts: 124
Joined: Tue Apr 30, 2019 6:46 am

by Mikedb

joejack951 wrote:
Fri May 03, 2019 1:40 pm
Mikedb wrote:
Wed May 01, 2019 9:27 pm
joejack951 wrote:
Wed May 01, 2019 6:41 pm
If you really wanted to make it work...

Machined a D-shaped 'shim' with a 27.2mm dia. blind hole in it, as deep as necessary to get the required seatpost extension with the shim all or mostly in the frame. Bond your seatpost into this 'shim' then clamp the shim in the frame. Probably heavy, and wouldn't be too cheap either for a one-off, but it should work.
Outside of weight (which I'm not concered about) any other cons to a setup like this?

Also, who would you recommend me going to in order to get something like this done?
PM me. I can possibly help.
Or if you prefer....try pming me on here.

by Weenie

Posts: 883
Joined: Sat Feb 07, 2009 5:52 am

by spud

another approach you might consider is to buy the frame/bike, cut a hunk off the bottom of the seatpost and have a machinist hogg out the inside of it to 27.2. Then bond it to your new post in the appropriate position so that you can actually clamp it.

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