Singlespeed & Fixed Gear - Chainline: Freewheel vs. cog?

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toman
06-26-05, 05:52 PM
On a regular freewheel hub, is there any difference in the chainline between a bmx type freewheel and a track cog? I'm thinking about switching from a freewheel to a bumbike setup while I save for a proper track hub, but I'm wondering if it will affect my chainline which is perfect as it is.

jacobs
06-26-05, 05:54 PM
It will have a little difference, but no more than 2-3mm.
baxtefer
06-26-05, 05:57 PM
http://www.sheldonbrown.com/chainline/#sprockets

r-dub
06-26-05, 08:08 PM
there will probably be a little bit of chainline difference unless you spend some time doing the math and getting it perfect. If that's the case, go for straight chainline with the fixed side and let the freewheel be a little bit off.
BostonFixed
06-26-05, 08:21 PM
The 2-3mm that jacobs said ISN'T going to make a difference.
IchbinJay
06-26-05, 09:24 PM
I concur. Depending on the type of chain you have (geared vs. BMX style) there is actually a good amount of play that will allow for the difference in positioning.
toman
06-26-05, 10:40 PM
cool, sounds like it should work fine since I'm using a bmx type chain and the chainline is about perfect as it is.