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 Post subject: 31.8 seat post? Or shim?
PostPosted: Sat Dec 08, 2018 12:48 pm 
Gold Trader
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Joined: Fri Jan 23, 2009 2:30 pm
Posts: 14934
Location: Surrey
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.


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PostPosted: Sat Dec 08, 2018 4:48 pm 
Old School Grand Master

Joined: Mon Feb 11, 2008 9:42 am
Posts: 3163
31.8? It might have been factory shimmed from new!


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 Post subject: Re:
PostPosted: Sat Dec 08, 2018 11:26 pm 
Devout Dirtbag

Joined: Mon Mar 28, 2016 11:02 pm
Posts: 132
https://rover.ebay.com/rover/0/0/0?mpre ... 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.


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 Post subject: Re:
PostPosted: Sat Dec 08, 2018 11:41 pm 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider

Joined: Thu May 06, 2010 10:05 pm
Posts: 7663
Location: Aberdeen
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.


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 Post subject: Re:
PostPosted: Sun Dec 09, 2018 1:50 am 
Gold Trader
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Joined: Fri Jan 23, 2009 2:30 pm
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Location: Surrey
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.


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PostPosted: Sun Dec 09, 2018 3:08 am 
Old School Grand Master
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Joined: Wed Feb 20, 2008 12:21 pm
Posts: 5966
Location: Lost in Translation
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.


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 Post subject: Re:
PostPosted: Sun Dec 09, 2018 10:05 am 
Devout Dirtbag

Joined: Mon Mar 28, 2016 11:02 pm
Posts: 132
As above, this eBay listing has a 31.8 > 27.2 shim.
https://rover.ebay.com/rover/0/0/0?mpre ... 0863658771


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 Post subject: Re:
PostPosted: Sun Dec 09, 2018 4:18 pm 
Retro Guru

Joined: Sun Aug 16, 2009 5:13 am
Posts: 528
Location: Canada
I have a Syncros hard core in 31.8*330.


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 Post subject: Re: Re:
PostPosted: Sun Dec 09, 2018 10:46 pm 
Gold Trader
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Joined: Fri Jan 23, 2009 2:30 pm
Posts: 14934
Location: Surrey
Madmax1993 wrote:
As above, this eBay listing has a 31.8 > 27.2 shim.
https://rover.ebay.com/rover/0/0/0?mpre ... 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.


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 Post subject: Re:
PostPosted: Mon Dec 10, 2018 9:03 am 
Retro Guru

Joined: Sun Aug 16, 2009 5:13 am
Posts: 528
Location: Canada
4 spares.


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