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Old 10-22-07, 10:31 AM   #1
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73mm Bottom Brackets?

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?
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Old 10-22-07, 10:37 AM   #2
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Originally Posted by bigbossman View Post
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?
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.
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Old 10-22-07, 10:45 AM   #3
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Originally Posted by bigbossman View Post
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?
Yes, it's a mtb size, very common.
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Old 10-22-07, 06:54 PM   #4
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This size was common with the early day downhill bikes and heavier mountain bikes.
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Old 10-22-07, 07:14 PM   #5
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Got any UN-7X 68x103's ?
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Old 10-22-07, 07:39 PM   #6
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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.
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Old 10-27-07, 04:52 PM   #7
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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.
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