Re: [CR] Columbus SL "Competition" Tubing


Example: Racing:Beryl Burton

Date: Sun, 18 Jul 2010 11:33:30 -0700
From: verktyg <verktyg@aol.com>
To: john@os2.dhs.org, Classicrendezvous@bikelist.org
References: <20100714.191619.9965.1@webmail08.vgs.untd.com> <69F30360FBE440AE8BA58C08B4C51230@QWERTY28> <4C42DDC8.9030001@os2.dhs.org>
In-Reply-To: <4C42DDC8.9030001@os2.dhs.org>
Subject: Re: [CR] Columbus SL "Competition" Tubing


Hi John,

What I wanted to find out, what is "Columbus SL Competition" tubing if there ever was such a thing, or was it catalog hype?

I have a 1984 Gitane Team Pro (replica) frame. The 1984 Gitane catalog lists the tubing as "Columbus SL Competition".

http://www.gitaneusa.com/images/catalog/1984/Page_08.jpg

The Columbus KL thread goes back to specs published on the Desperado Cycles website:

http://desperadocycles.com/Lowdown_On_Tubing.html

Scroll down to table 4

There are 2 different listings for "Columbus SL" tubing. The top one is probably a typo and should be "Columbus KL". Note, there are several other "typos" in that table.

Brian Baylis suggested that the lighter weight specs were actually those for KL tubing. That's where things got off track.

I have several same size Columbus SL frames. The Gitane frame "feels" much lighter and the tubes visible in the BB are thinner and appear to be silver brazed. It's more like a Reynolds 753 frame.

It would be nice to know what kind of tubing the 84 Gitane Team Pro frame was made of.

Regards,

Chas. Colerich Oakland, CA USA

John Thompson wrote:
> On 07/15/2010 09:16 AM, Jon M. Crate wrote:
>
>> I would like to know the difference in weight between the
>> 0.7/0.5/0.7 "Lightweight" Columbus SL" and the "Standard"
>> 0.9/0.6/0.9 for the entire tubeset. Obviously there are other
>> variables even for the same size frames like the type of lugs,
>> amount of braising, amount of paint or internal coatings. I don't
>> know if these variables are large enough to overcome the tube set
>> differences, or not.
>
> The published weights are listed in my Columbus catalog:
>
> SL (09./0.6/0.9): 1925gm
> KL (0.7/0.5/0/7): 1670gm
>
> http://www.os2.dhs.org/~john/catalogs/Columbus-tubes.pdf