Shim Converter?

Discuss light weight issues concerning road bikes & parts.
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syplam
Posts: 61
Joined: Thu Feb 02, 2017 7:30 am

by syplam

Hi, im getting a frame for 31.6 seatposts...am thinking if its safe to use a shim converter so that i can use a 27.2 seatpost? anything i should be careful of if i use a shim converter?

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F45
Posts: 856
Joined: Wed Jun 08, 2011 6:08 am

by F45

I use an aluminum one. I used a deburring tool to radius the top lip so it wasn't so sharp.

The K Force seatpost is on a hardtail xc bike so it sees some stress. The carbon is cracking, but not around the shim.

by Weenie


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Rick
Posts: 2001
Joined: Sat Aug 29, 2009 4:30 pm

by Rick

I did that for a while. I used a thomson aluminum shim.
It is perfectly safe.
There were only a few mnor downsides:
1. It adds weight, so you don't really save any weight over going to a larger seatpost.
2. It creates an additional gap where the shim doesn't quite close, that could be a path for water intrusion. Fill it with grease.
3. I could never decide of the top rim of the seatpost clamp should go over the top rim of the shim, or under it. I think I ended up keeping the shim up just the thickness of the seatpost clamp so that the clamp sat just underneath the shim's lip. If the clamp is over the shim's lip, it might create a stress concentration on the seatpost.
4. When you adjust the saddle, everything slides around, so it is a little more inconveniently fiddly.

syplam
Posts: 61
Joined: Thu Feb 02, 2017 7:30 am

by syplam

thanks for the info, guess i will just sell my old post and get a new one :S

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