[CR] TA Pro 5 BIS Chain Ring Size and Tooth Count

(Example: Framebuilders:Pino Morroni)

Date: Tue, 29 Dec 2009 12:57:06 -0500
From: "Wayne Bingham" <veloclassique@gmail.com>
To: <classicrendezvous@bikelist.org>
Subject: [CR] TA Pro 5 BIS Chain Ring Size and Tooth Count


I just wanted to add a bit of information to this discussion. There are several types of TA Pro 5 "outer" rings. The more common is the model CY 205, which has the combination 50.4 5-pin BCD and 80 6-pin BCD drillings. These were available in 36t to 68t. There are also models 205 (3/32") and P205 (1/8") that have "single drilling" 50.4 5-pin BCD drilling only. These were available in 28t to 68t. In addition, there is a model T205 3/32" ring with "single drilling" 50.4 5-pin BCD that was designed for Trials (in the catalog, it specifically states "At the request of 'Trials' bicycle makers, T.A. have introduced a range of chainrings in FORTAL 2017 A-T4 light alloy to meet their special requirements"). These were available in 19t to 25t.

Just wanted to add what I could to the knowledge-base and archives.

Wayne

-- Wayne Bingham Velo Classique PO Box 2069 Purcellville, VA 20134 USA 540-338-8376 http://www.veloclassique.com

From: John Clay <jmedclay@yahoo.com> Date: Mon, Dec 28, 2009 at 7:45 PM Subject: Re: [CR] TA Pro5, Stronglight 49 Crank/Chainring (and shifting) Questions To: John Wood <braxton72@gmail.com>, Thomas Adams <thomasthomasa@yahoo.com> Cc: Classic Rendezvous <classicrendezvous@bikelist.org>

Thanks Thomas and everybody else for the input! Somebody I ran into (and can't find again) mentioned having a 19t chainring with a 50.4mm BCD for direct mounting to the inside of the TA flange. You could then set up something like a 44/20 to make a dandy touring double.

I'm pretty partial to the range I got with my 44/32/20 and modified straight 8 (13-17, 20, 26, 34), I did need/appreciate the 20/34 more than a few times; it was fabulous in some small choppy mountains I encountered. Lately though it's occurred to me that I could do pretty much the same thing with a double - and the one thing that I didn't like with my triple was the very wide tread. This would solve it, so I'm looking.

Thanks again

John
Tallahassee, Florida