Cycling Equipment · Public discussion

68 vs 73 Bottom Bracket Question

Started by LR · · Last activity · 2 posts · 428 views

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Cycling Equipment
Published
21 July 2005
Last activity
21 July 2005
Original author
LR
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  1. Is it possible to put a bottom bracket meant for a 73 mm bottom bracket
    shell into a shell meant for a 68mm shell with the requisite 5mm of spacers?

    I know physically it would be possible, but do you run into structural
    and/or safety concerns (not to mention the wider Q factor).

    Thanks.

    LR

  2. LR said:

    Is it possible to put a bottom bracket meant for a 73 mm bottom bracket
    shell into a shell meant for a 68mm shell with the requisite 5mm of spacers?

    Yes!, but you mean a 2.5mm spacer (2.5mm on each side = 5mm)

    If the bottom bracket has a shoulder on the drive side, you only need
    one 2.5mm spacer (Some bottom brackets ship with a spacer, so you can
    use them for 68 or 73) - No shoulder means 2.5 mm of threads showing on
    each side.

    Quoted message said:

    I know physically it would be possible, but do you run into structural
    and/or safety concerns (not to mention the wider Q factor).

    Done it many time before. Only the body is 5mm longer. Spindle is the
    same length, same Q.

    -n

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