Tandem Cycling - 140mm tandem rear hub in a 135mm alu dropout?
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.
08-30-09, 04:10 PM
Is there a problem/risk with fitting a 140mm hub in a 135mm aluminium frame rear dropout? I wouldn't cold set it obviously, but just spread it when putting the hub in.
Thanks in advance for your collective wisdom.
08-30-09, 08:33 PM
I'm no metal expert but I have always been told to never bend aluminum. On those occaisions when I have bent aluminum in non cycling applications I either broke the aluminum or clearly weakened it. So...I would never consider bending anything on an aluminum bike frame.
08-30-09, 08:43 PM
I guess it's really a matter of sematics or definition. All materials strech and bend. I guess the quesion I have is if I pre-flex ( not cold set as steal but pry open and flex) a tandem frame 5mm for the rear hub, is there a problem?
I'm sure there are a lot of people with opinions, but I want facts and figures. Can it be done and are there quantifiable risks?
If you want numbers you probably need to talk to a materials engineer, or at very least a framebuilder. Conventional wisdom though is that in an aluminum frame, you should always use the size hub it was designed for.
09-08-09, 06:32 PM
I've been doing it for about 3 years on my Cannondale without any problem.
09-08-09, 10:21 PM
i wouldn't worry about it. back in the old days i reset my bonded al fork on my single bike 2 or 3 times after crashes and it worked fine. i was only having to reset i couple of mm's not any huge amount.
Powered by vBulletin® Version 4.1.12 Copyright © 2013 vBulletin Solutions, Inc. All rights reserved.