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  1. #1
    Dolce far niente bigbossman's Avatar
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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?
    "Love is not the dying moan of a distant violin, itís the triumphant twang of a bedspring."

    S. J. Perelman

  2. #2
    Senior Member MudPie's Avatar
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    Quote 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.

  3. #3
    biked well well biked's Avatar
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    Quote 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.

  4. #4
    vasracer
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    This size was common with the early day downhill bikes and heavier mountain bikes.

  5. #5
    cab horn
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    Got any UN-7X 68x103's ?
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  6. #6
    biked well well biked's Avatar
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    Quote Originally Posted by vasracer View Post
    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.

  7. #7
    Newbie
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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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