Cycling Equipment · Public discussion

Bottom Bracket Size?

Started by Amollitor · · Last activity · 4 posts · 893 views

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Original section
Cycling Equipment
Published
9 August 2003
Last activity
10 August 2003
Original author
Amollitor
Posts
4
Discussion status
Public discussion
Total views
893
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0
Topics
Bottom bracketsFrame sizingTaper and peaking

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  1. Original post
    Amollitor
    Archived post
    #1

    I need a square-taper bottom bracket for a road frame. The diameter is 68, and the BB shell measures
    about 69 mm long. I want to use a Shimano 105 7/8 speed crank.

    I'm looking at a Shimano BB-UN73. Are these square (as opposed to splined)?

    What length would be appropriate?

    Thanks! Al Mollitor, Sharon MA

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  2. Huw Pritchard
    Archived post
    #2

    On Sat, 09 Aug 2003 17:23:05 +0000, AMollitor did issue forth:

    Quoted message said:

    I need a square-taper bottom bracket for a road frame. The diameter is 68, and the BB shell
    measures about 69 mm long. I want to use a Shimano 105
    7/8 speed crank.

    I'm looking at a Shimano BB-UN73. Are these square (as opposed to splined)?

    What length would be appropriate?

    Yup, the UN73 is square tapered. Have a look here to find out more about the spindle length
    you'll need:

    sheldonbrown.combbsize.html

    From your measurements, it'll be a 68mm shell.

    Huw

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  3. Amollitor
    Archived post
    #3

    Huw: Thanks! I should have know the Guru would have the information! Al

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  4. Qui Si Parla Ca
    Archived post
    #4

    amolitor-<< I need a square-taper bottom bracket for a road frame. The diameter is 68, and the BB
    shell measures about 69 mm long. I want to use a Shimano 105 7/8 speed crank. >><BR><BR>

    shimano BB in length 107mm...english threading...

    Like a UN-72/3...

    Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302
    (303)440-3535 vecchios.comvecchios.com "Ruote convenzionali costruite eccezionalmente bene"

    Report

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