Mountain Biking - Bottom Bracket Size
Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.
08-18-06, 01:13 PM
I've searched and I can't find an answer to this. my current frame has a 68mm bottom bracket shell and I'm going to a frame with a 73mm shell. I believe I need a new bottom bracket that is 73mm, but to keep everything else the same, do I need to get a different size spindle as well? Like if I have a 68, 113, do I get a 73, 113 or does it need to be larger because of the larger shell?
You won't need a new BB if it is a 'universal' one - - it should say 68/73 if it is. A lot of Race Face BBs are both; a lot of FSAs are one-width-only. Pull your BB and look at its markings; or if you know the exact model, look it up on the company web site.
Should not need a longer spindle; 68/73s are made for the wider width. The non-drive-side cup just screws in farther to fit a 68 along with a drive-side spacer.
08-18-06, 03:29 PM
Stick with a 73x113. the 68 or 73 denotes the bottom bracket shell width. The 113 denotes the spidle width.
08-18-06, 03:36 PM
Thank you both. I wasn't sure if I needed a wider spindle for the wider shell or not.
Powered by vBulletin® Version 4.1.12 Copyright © 2014 vBulletin Solutions, Inc. All rights reserved.