bottom bracket advice

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09-26-12 | 08:51 PM

67tony

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Joined: Feb 2012

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From: Williamsburg, VA Sebastian, FL

Bikes: 1987 Centurion Ironman Master, 1992 Koga Miyata Exerciser, 1992 Schwinn Crosscut

bottom bracket advice

If a Schwinn Super Sport bottom bracket shell measures 65mm, and I'm using a Truvativ BB adapter, what length BB spindle might I need?

I'm planning on double front cranks. One SS will have a Shimano 600, and the other one will be Sun Tour.

(I am renovating two fillet-brazed early '70's Super Sport frames...)

Last edited by 67tony; 09-26-12 at 09:22 PM.

09-27-12 | 05:15 AM

pastorbobnlnh

Freewheel Medic

Joined: Oct 2005

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From: An Island on the Coast of GA!

Bikes: Snazzy* Schwinns, Classy Cannondales & a Super Pro Aero Lotus (* Ed.)

Tony,

In my experience it is impossible to know what size cartridge BB is needed for the BB adapters. It's a matter of trail and error. Guess at a size, install the BB and crankset and see how it fits. Keep repeating until you hit the sweet spot.

There are just too many variables. Each crankset requires a different size. The adapter adds to the mystery. The SS's frame geometry creates a third variable.

Sorry that I can't be more helpful.