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PostPosted: Wed Aug 21, 2013 7:44 pm 
Retro Guru
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Joined: Thu Jun 23, 2011 11:25 pm
Posts: 1787
Location: It's not easy being a dolphin.
Take the old clamp into a LBS and say "One like this please, but not f*ucked". I am an Engineer.


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PostPosted: Wed Aug 21, 2013 7:49 pm 
BoTM | Gold | PoTM
BoTM | Gold | PoTM
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Joined: Thu Jan 19, 2012 2:20 pm
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Location: Sunny Cornwall
Splatter Paint wrote:
Come on then raidan73, tell us the size!

SP


Sorry SP I'll have to leave you hanging on a bit longer. My wife wanted to go out riding tonight so I had to take one off another bike for the time being!


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PostPosted: Thu Aug 22, 2013 2:31 am 
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Joined: Mon Sep 03, 2012 2:26 am
Posts: 710
Location: Kuala Lumpur
Andy R wrote:
RadNomad wrote:
The mathematical constant Pi (3.142) is the relationship between a circle's diameter and circumference. Therefore simply measure the external circumference of the seat tube (if you don't have a flexible tape measure you can wrap some paper around and mark it, or use a bit of string) then divide that measurement by 3.142 to get the exact external diameter of the tube.



Mmmm - could have sworn I said much the same this morning :)


Yup.. just giving a bit of background so it will enable anyone to get a result on any size tube.. :wink:


Last edited by RadNomad on Thu Aug 22, 2013 4:35 am, edited 1 time in total.

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PostPosted: Thu Aug 22, 2013 7:50 pm 
BoTM | Gold | PoTM
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Joined: Thu Jan 19, 2012 2:20 pm
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Location: Sunny Cornwall
Well my best measuring using a piece of paper wrapped around the tube was 94.5mm which means I need a 30.14 clamp! The closest I can seem to find is 30.4mm so I'm guessing it will have to do.


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PostPosted: Thu Aug 22, 2013 10:46 pm 
retrobike rider
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Joined: Wed Apr 15, 2009 1:08 pm
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Location: Woking
Interesting, I never considered the external butting. You learn something new every day.

SP


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PostPosted: Thu Aug 22, 2013 10:56 pm 
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Joined: Tue Aug 07, 2007 12:22 pm
Posts: 2942
Location: Platsa, Messinias, Greece
raidan73 wrote:
Well my best measuring using a piece of paper wrapped around the tube was 94.5mm which means I need a 30.14 clamp! The closest I can seem to find is 30.4mm so I'm guessing it will have to do.

30mm is closer than 30.4mm.

And it will be 30mm, Kona never used 30.14mm...


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