Bike Forums - View Single Post - External BB to square taper

05-25-11 | 09:36 AM

#2

cyccommute

Mad bike riding scientist

Joined: Nov 2004

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From: Denver, CO

Bikes: Some silver ones, a red one, a black and orange one, and a few titanium ones

Quote:

Originally Posted by Mojo GoGo

Does anyone know if a bottom bracket / bearing kit exists for converting an bike that has external bearing cups (Shimano 6600 series) to an older square taper design bottom bracket?

I know this is a "backwards" conversion but I've got a old Specialized Allez frame with a square taper BB that I'm running as a single speed. It was my first bike and the shop I got it at sized me incorrectly (it's a 50 cm and I should be a 52 or 54). I also have a Trek Madone 5.2 frame (unfortunately just hanging on the wall) that is the correct size. Wondering if there is any way I can move my current crank over with a BB conversion kit rather than having to buy a crank and bearings.

Thanks in advance.

You just need the proper bottom bracket for the square taper. The external bearings thread into the bottom bracket shell of the bike with the same thread pitch and direction as a cassette bearing.

You can't use the external bearings, however. Different system, diameters and spindle length.

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