Classic & Vintage - Help with large bottom bracket adapter

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.



PDA
The Speaker Guy
06-20-05, 11:11 PM
I have a 1973 Schwinn Speedster on which I have installed a Sora drivetrain. I am having problems with the bottom bracket coming loose.

I have two press in cup adapters. The drive side of the BB is screwed firmly to the cup, but the opposite side is merely supported. There is nothing other than friction keeping the drive side cup firmly in the BB.

I think I need to drill holes through the adapter cups to allow the two cups to clam shell the BB.

Any other approaches you may suggest?

Sierra
06-21-05, 06:36 AM
Would a little Loktite between the cup and the bracket work? Maybe the green stuff that is meant to hold bearings in place.
frameteam2003
06-21-05, 08:56 PM
something like this:
http://greatadventuresports.com/site/page.cfm?PageID=125&SKU=CR0500
sam

The Speaker Guy
09-03-05, 04:54 PM
I ended up putting three SS # 10 bolts through the two sides. No problems since.
cruentus
09-03-05, 07:26 PM
I've converted a few large BBs for modern three piece cranks, but I've always used the adapter made by TruVativ.

Works like a charm.

http://sheldonbrown.com/harris/images/opc-adaptor-truvativ.jpg
greybeard87
09-05-05, 03:07 PM
[QUOTE=cruentus]I've converted a few large BBs for modern three piece cranks, but I've always used the adapter made by TruVativ.

Works like a charm.

QUOTE]

Thanks cruentus, I was just about to post asking if there was a conversion available. The Truvativ kit is only $24.95, seems reasonable enough..........