Bicycle Mechanics - 73mm Bottom Brackets?

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

View Full Version : 73mm Bottom Brackets?

bigbossman
10-22-07, 10:31 AM
I just picked up a bag full of NOS Shimano UN 52 and UN 72 BB's. Some are 68mm shell, but a bunch are 73mm. I'm only familiar with 68 and 70.... are these 73mm mountain bike BB's?

Anyone need one, cheap? :D

MudPie
10-22-07, 10:37 AM
I just picked up a bag full of NOS Shimano UN 52 and UN 72 BB's. Some are 68mm shell, but a bunch are 73mm. I'm only familiar with 68 and 70.... are these 73mm mountain bike BB's?

Anyone need one, cheap? :D

My Schwinn Homegrown hardtail mountain bike uses a UN 52, 73x107. The reason I know is I just replaced it about a week ago. Had I procrastinated a week, I would've bought one from you.
well biked
10-22-07, 10:45 AM
I just picked up a bag full of NOS Shimano UN 52 and UN 72 BB's. Some are 68mm shell, but a bunch are 73mm. I'm only familiar with 68 and 70.... are these 73mm mountain bike BB's?

Anyone need one, cheap? :D

Yes, it's a mtb size, very common.

vasracer
10-22-07, 06:54 PM
This size was common with the early day downhill bikes and heavier mountain bikes.
operator
10-22-07, 07:14 PM
Got any UN-7X 68x103's ?
well biked
10-22-07, 07:39 PM
This size was common with the early day downhill bikes and heavier mountain bikes.


It's a common size, period. I've currently got seven mountain bikes in my basement, and three of them have 73mm shells. They're all XC rigs.
jmai
10-27-07, 04:52 PM
I'm looking for an e-type (would say UN52-E or UN72-E or have an sticker with an E on it), in 73mm with 113mm spindle. Have any that size? Cheers.