Singlespeed & Fixed Gear - Upgrade to Shimano External BB on Langster?

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
shmee40
03-12-10, 06:07 AM
I've tried searching everywhere but to no avail..........is it possible to upgrade my BB to a shimano external BB on a 2009 langster? I can't find any info anywhere on whether or not the BB will thread in properly. CUrrent BB is a Sealed cartridge, square taper, 68mm x 103mm. I have a ultegra crank that I want to throw on.

Metzinger
03-12-10, 06:36 AM
68mm is standard British threading. New BB must be also.
Steev
03-12-10, 06:54 AM
It will go on fine assuming your cups are English threaded. You'll need to use the inside ring position to get a 42mm chainline.

operator
03-12-10, 06:54 AM
I've tried searching everywhere but to no avail..........is it possible to upgrade my BB to a shimano external BB on a 2009 langster? I can't find any info anywhere on whether or not the BB will thread in properly. CUrrent BB is a Sealed cartridge, square taper, 68mm x 103mm. I have a ultegra crank that I want to throw on.

Yes, the standard english shimano ext bb cups will be a straight drop in. Assuming there isn't horrible issues with BB facing on your bike, it should be ok.