31.8 seat post? Or shim?
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Author:  ishaw [ Sat Dec 08, 2018 12:48 pm ]
Post subject:  31.8 seat post? Or shim?

I bought a nice frame off here recently but it has a slightly obscure seat post size in 31.8. Anyone know where or Can recommend a good seat post in this size? I can only find Brompton ones, or others seemingly designed for folding bikes (which it isnt).

Ideally I was hoping for carbon, but would be happy enough with a decent lightweight black post.

I do have a 31.6 post, and also a 30.9. What do people think about swimming, and would I struggle to find a shim up to the odd 31.8 size?

I know I could go the coke can route, but I'd rather not bodge this as it's a titanium frame.

Author:  mattr [ Sat Dec 08, 2018 4:48 pm ]
Post subject:  Re: 31.8 seat post? Or shim?

31.8? It might have been factory shimmed from new!

Author:  Madmax1993 [ Sat Dec 08, 2018 11:26 pm ]
Post subject:  Re: ... 0863658771

I had a Voodoo Canzo which had a 30.0mm seat tube, and I wanted to use a dropper post, so I shimmed down to 27.2 with no issues for about 2-3 years.

Author:  jimo746 [ Sat Dec 08, 2018 11:41 pm ]
Post subject:  Re:

I've been having a similar issue today with a 28.0 seat tube and I have 25.4, 26.4 and loads of 27.2 seat posts :facepalm:

Probably your best bet is to find a shim to allow you to fit a common size seatpost, as in the above post.
I agree that whilst it may well work just fine the coke can shim method is not really the "done thing" for a Ti frame.

Author:  ishaw [ Sun Dec 09, 2018 1:50 am ]
Post subject:  Re:

Thanks for the replies. I think a shim is the way to go, as has been said, and true to frames I already own, ti frames are often shimmed by design. Just need to find one thst rolls some standard size up to 31.8.

Author:  one-eyed_jim [ Sun Dec 09, 2018 3:08 am ]
Post subject:  Re: 31.8 seat post? Or shim?

I've got a titanium Syncros in 31.8mm kicking around somewhere. It's 330mm, if memory serves. Drop me a PM if that's of any interest, and I'll have a rummage. Circa Y2K.

Author:  Madmax1993 [ Sun Dec 09, 2018 10:05 am ]
Post subject:  Re:

As above, this eBay listing has a 31.8 > 27.2 shim. ... 0863658771

Author:  roc6839 [ Sun Dec 09, 2018 4:18 pm ]
Post subject:  Re:


Author:  ishaw [ Sun Dec 09, 2018 10:46 pm ]
Post subject:  Re: Re:

Madmax1993 wrote:
As above, this eBay listing has a 31.8 > 27.2 shim. ... 0863658771

Not sure I want to run a 27.2 post as it may look a little weedy. It is certainly an option though, thanks.

Author:  roc6839 [ Mon Dec 10, 2018 9:03 am ]
Post subject:  Re:

4 spares.

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IMG_20181209_235746.jpg [ 72.55 KiB | Viewed 443 times ]

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