Re: [CR] SR bottom bracket axle question

(Example: Production Builders:Peugeot:PX-10LE)

From: "CyclArt Shop" <shop@cyclart.com>
To: Jim Ready <jimr@rfj.com>, CR discussion list <classicrendezvous@bikelist.org>
Date: Fri, 10 Apr 2009 11:27:57 -0700
Thread-Topic: [CR] SR bottom bracket axle question
Thread-Index: Acm6CcklXfUeSEnKTnONy7QPE+drog==
In-Reply-To: <AC8ECC32B3874B628F08CC2B3D87547D@JIMSSONY>
Subject: Re: [CR] SR bottom bracket axle question


Jim,

I haven't tried it, but I'm pretty certain it will not work. The smaller ba ll diameter/same cup wall thickness combo requires a wider center section o n the spindle of the titanium axles to keep chainline equal. For example, a 68-SS-120 SR titanium axle has a 52mm center section. The same designation NR steel axle has a 49.5mm center section. If you sub the steel axle for t he ti, your chainline will move outboard (by about 2.5mm,) and your adjusta ble cup will probably disappear into the shell.

In any case, it's a bad idea to use an axle ground for bigger bearings with smaller ones. The bearings will ride differently on the race, probably dam aging it.

Greg Reiche CyclArt Vista, CA USA

-----Original Message----- From: classicrendezvous-bounces@bikelist.org [mailto:classicrendezvous-bounces@bikelist.org]On Behalf Of Jim Ready Sent: Friday, April 10, 2009 8:54 AM To: CR discussion list Subject: [CR] SR bottom bracket axle question

I searched on the archives to no avail so..

I have a couple of Super Record alloy with steel races bottom bracket cup sets with no axles. I know these take smaller ball bearings, 3/16s I believe. Can I substitute a Campy steel axle (e.g., 68-SS-120 etc) and have it work ok?

I know I can just put one together and measure it but if someone already knows what will (or won't) work that would save me some time.

Jim Ready Cupertino, California USA

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