Re: [CR]BB Questions

(Example: Framebuilders)

From: <travis.harry@gmail.com>
Date: Wed, 31 Oct 2007 19:02:14 -0400
To: <classicrendezvous@bikelist.org>
In-Reply-To: <622181.71416.qm@web82215.mail.mud.yahoo.com>
Subject: Re: [CR]BB Questions

Anyone have a list of what Phil Wood BB's are the best fit for the most common classic cranks? I've usually done this by trial and error, or by checking the Phil BB on another bike with the same crankset, but this is a pain, as it usually involves removing crankarms at the minimum.   I know that most classic cranks take a Phil BB which is offset rather than symmetrical, but has anyone complied a list of the specific Phil BB's recommended for the major classic cranks, i.e.:   Campy NR/SR double  Campy NR triple  Various Campy GS doubles and triples  Ofmega/Avocet double and triple.  Stronglight double and triple  TA Cyclotourist double and triple  TA Professional 3-arm double and triple  Zeus Competition/Criterium/2000 double  Mavic double  Early Dura-Ace double  Early Deore double and triple  SunTour Superbe and Superbe Pro double


>From http://www.branfordbike.com

# Spindle lengths with a Campagnolo [ISO] taper are: 102, 111 and 115 mm. Designed to fit 68 and 70 mm long frame bottom bracket shells. Asymmetrical 111 spindle now available for Campagnolo 10 speed triple cranks. Custom 5 mm offset also available for older Nuovo and Super Record road cranks. Please specify what model and year Campagnolo crank you will be using your new Phil bottom bracket with, when placing your order.

# Spindle lengths for Shimano [JIS] and other major manufacturers are: 103, 105, 108, 111, 113, 116, 119, 123, 125, 127.5, 130 and 135 mm. Designed to fit 68 or 70 mm, road or mountain frame, bottom bracket shells. ________

The rest of what you need is to know whether the original crankset length was specified according to Shimano or to Campagnolo standard.

http://www.sheldonbrown.com/bbsize.html provides data for serveral manufacturers. Ofmega/Avocet axles are non-conforming, and Suntour followed both Campag and Shimano at different times. Superbe Pro follows Campag.

Further: "If you install an ISO crank on a J.I.S. spindle, it will sit about 4.5 mm farther out than it would on an ISO spindle of the same length. [and perhaps too far out to be securely seated.]

"Conversely, if you install a J.I.S. crank on an ISO spindle, it will wind up about 4.5 mm farther in than it would on a J.I.S spindle of the same length."

http://www.sheldonbrown.com/bbtaper.html