Re: [CR]Phase II - Raleigh fun

(Example: Production Builders:Tonard)

Date: Thu, 08 Jun 2006 20:24:03 -0500
To: "Tromper" <growfmonster@comcast.net>
From: "Mark Stonich" <mark@bikesmithdesign.com>
Subject: Re: [CR]Phase II - Raleigh fun
In-Reply-To: <JOELJNMNKMKHDHKGPKPOEEPICCAA.growfmonster@comcast.net>
References: <e1c5f1512f5e.4488abbc@optonline.net>
cc: classic <classicrendezvous@bikelist.org>

At 6/8/2006 05:27 PM -0700, Tromper wrote:
>The question I have is pretty simple. Is there an inexpensive way to put a
>different (cotterless) bottom bracket into the 71mm shell?

If it's 24tpi threads, all you have to do is use a 73mm BB with a 2mm fixed cup/freewheel spacer under the fixed cup.

If it's the dreaded 26tpi then just find a local framebuilder to retap to 24tpi. If you are really persuasive, you might get him to face it down to 68mm. The last time I had this done the builder owed me a favor so I'm at 68mm. Some people claim you would have to fill the old threads with silver or brass before retapping. Modern BBs have so many threads of engagement that I don't see a need for this. Gotta be stronger than aluminum.
>A secondary question comes up, since I live the the hilly Puget Sound area,
>would be appropriate size to make this a triple vs. the double that it's
>standard with?

Spindle length for a triple varies widely from crank to crank. Anywhere from 133mm to 110mm.

Mark Stonich;
Minneapolis Minnesota
http://mnhpva.org
http://bikesmithdesign.com