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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 09-06-10, 10:20 PM   #1
kansca
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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!
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Old 09-06-10, 10:54 PM   #2
Dr. Banzai
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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?
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Old 09-07-10, 07:31 AM   #3
kansca
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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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