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  1. #1
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    Jan 2010
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    BMX freewheel screwed my chainline

    Hey all- Finally used the other side of my Pista's flip-flop hub to exercise a SS option and was very uphappy to find my 42mm chainline wide by 6mm at the rear. The freewheel is a Shimano MX-30, and it even fouls on the chainstay toward the front half of the fork ends. Are there other freewheels with narrower bodies? Have been reading stale posts all day & going crazy, nor do White etc seem to publish any specs for body width.
    Hoping for a tip on a freewheel that matches (or at least is close to) the chainline produces by a FG cog. Thanks!

  2. #2
    Oscillation overthruster Dr. Banzai's Avatar
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    May 2010
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    Duncan, BC
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    Cinelli Mash / CAAD9 5
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    Every bmx I have ever owned was 120mm and never had a freewheel rub.

    What make of hub are you running?

  3. #3
    Newbie
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    The hub is stock Bianchi, looks very similar to the Formula hubs. The shoulders are the same depth on both sides of the hub. The Soma cog gave a perfect 42mm chainline on the fixed side, but the Shimano SF-MX30 works horribly on the freewheel side (and sorry, it's the seatstay it's fouling, not the chainstay). The freewheel body is over 16mm wide - are the Whites or 1/8" Shimano SF-1200 hubs any narrower?

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