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PostPosted: Sat May 04, 2013 2:15 pm 
Retro Guru
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Joined: Thu Nov 17, 2011 9:51 am
Posts: 977
With a 29.4 internal diameter!

PostPosted: Sat May 04, 2013 4:57 pm 
retrobike rider
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Joined: Tue Jan 29, 2008 11:04 pm
Posts: 1784
Location: A wretched hive of scum and villainy...
Hi Fattiman,

That's pretty chunky for OX Plat...I don't think it comes in anything with that thick a wall.

OX Plat 1 1/4"/31.8mm tubing comes in with a 0.8mm wall or under. 31.8 ext- 29.6 int would require 1.1mm wall. Even OX headtubes aren't that thick.
Have a look at the downloadable list from Henry James for the tube specs.

Is it definitely not an external butted tube, or an internal/external sleeve?

If you're not completely fussed, there's plenty of decent cold drawn 4130 Cro-Mo (TT Verus level) around with 0.035" wall will give you a slightly oversized 29.9mm internal, or 0.049" will give 26.8mm internal which could be reamed out, at a stretch, if we're talking seatposts here.
Pretty hard to find anything in between.

All the best,

PostPosted: Sun May 05, 2013 9:31 pm 
Dirt Disciple

Joined: Sat Dec 01, 2012 4:31 am
Posts: 63
Location: Toronto
Why so specific?

PostPosted: Mon May 06, 2013 11:35 am 
Retro Guru

Joined: Sat Dec 03, 2005 11:16 pm
Posts: 296
Location: Bristol uk
Yo Eddy repair at a guess.

PostPosted: Mon May 06, 2013 4:42 pm 
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Joined: Fri Jun 12, 2009 11:58 pm
Posts: 793
Location: Quantocks
Sizing aside, 1st thought that came to mind was sawing it out of a used frame. KHS or DiamondBack perhaps.
Larger frames are somewhat unloved & cheaper to source giving more length to the donor tube.

PostPosted: Wed May 08, 2013 12:53 pm 
BoTM Winner
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Joined: Wed Mar 29, 2006 1:56 pm
Posts: 1018
Location: Guernsey
that's a really unusual size. Whats to OD 31.7?
hear are most of the common sizes

a 31.7 od tube with a 1mm wall thickness would give you 29.7 which is too big so a wall thickness of 1.15m would do you.

or you could go with a 32mm head tube and ream it out.

Is that ID correct . is the tube butted or damaged?

I have repaired a few frames but have not come across that before. best of luck.

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