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PostPosted: Sat Jan 12, 2013 8:55 pm 
Dirt Disciple

Joined: Fri Nov 13, 2009 10:59 pm
Posts: 32
Location: Staffordshire UK
I recently bought a very nice bundle of stuff which includes a 26,2mm seatpin. Obviously 531 butted is 27.2. Should I crunch up the pinchbolt or get looking for a seatpin that fits perfectly?


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PostPosted: Sat Jan 12, 2013 8:59 pm 
Old School Hero

Joined: Sun Sep 16, 2012 9:54 pm
Posts: 241
Definitely not the first one. Either shim or replace. Cracked seat tube not funny!


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PostPosted: Sat Jan 12, 2013 9:02 pm 
Dirt Disciple

Joined: Fri Nov 13, 2009 10:59 pm
Posts: 32
Location: Staffordshire UK
Thanks for that. Better add a 27.2 to the shopping list then.


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PostPosted: Sat Jan 12, 2013 9:05 pm 
Retro Guru

Joined: Tue Oct 16, 2012 4:16 pm
Posts: 1568
Location: NOTTINGHAM
shim is far cheaper option if your seatpost is nice?


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PostPosted: Sat Jan 12, 2013 9:08 pm 
Dirt Disciple

Joined: Fri Nov 13, 2009 10:59 pm
Posts: 32
Location: Staffordshire UK
Tell me more. Whatare these shim of which you speak? OK, I know it is a thin thing that takes up unwanted space, but can you just buy them or is it a case of using bits of beer can or something. 1mm is not a lot!


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PostPosted: Sat Jan 12, 2013 9:15 pm 
Retro Guru

Joined: Tue Oct 16, 2012 4:16 pm
Posts: 1568
Location: NOTTINGHAM
many options out there on the www, simple example is: http://problemsolversbike.com/products/seatpost_shims

they come in all sizes so find one that 26.2 - 27.2 and it's job done if your happy with your existing seatpost. apply a little grease during the install.


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PostPosted: Sat Jan 12, 2013 9:27 pm 
retrobike rider
retrobike rider
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Joined: Fri Aug 08, 2008 2:36 pm
Posts: 16749
Location: Yorkshire, England
Wouldn't have thought you would find a ready made shim from that size.
Most shim from the standard sizes 25.0 for USE some 25.4 for old 1"
then 27.2 to larger seatpost size and then the fatter standard sizes...
You may find some 26.8 to larger sizes as well.

But 27.2 is a common standard size, I would go looking for that and not a shim.


P.S. It's not 1mm but actually 0.5mm you are shimming with it being round.

You could probably bodge a 25.4 to 26.4 seatpost shim to fit with a bit of bending.


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PostPosted: Sat Jan 12, 2013 9:28 pm 
Dirt Disciple

Joined: Fri Nov 13, 2009 10:59 pm
Posts: 32
Location: Staffordshire UK
That seems Ok, but none of those seem to be expanding a 26.2 to a 27.2. It also seems a bit "messy". This is just a bundle of stuff I bought for the frame - a Viking Severn Valley just like the one I was bought for passing my O levels way back when. It came with some bits including a rattly seatpin 1mm too small. Looks like I will not be using that when I built the retrobike of my dreams. Yes, just another old man trying to turn back time....


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PostPosted: Sat Jan 12, 2013 9:57 pm 
Retro Guru
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Joined: Sun Jun 24, 2012 10:27 pm
Posts: 390
Location: London
27.2 seatpost are common, I would just start to look for proper stuff.
And now nor something completely different ;) do you have any pictures of your bikes from your signature, especially that Sid Mottram? What is serial number? Sorry for off topic, but there are not many around and it happen that I have one :)


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PostPosted: Sat Jan 12, 2013 10:06 pm 
Old School Grand Master
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Joined: Fri Oct 14, 2011 8:41 pm
Posts: 8247
Location: Cumbria
Viking Severn Valley was launched (well it's second incarnation) at the Harrogate show 1978. The show ones had the new Campag Gran Sport Ensemble (wasn't called a groupset then).................

Very nice :D


Shaun

PS best to find a 27.2 seat post.


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