Singlespeed & Fixed Gear - Cog Width

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Adker

11-22-04, 06:14 PM

Are all track cogs the same width?

I ask this because of a problem I am facing with a recent conversion. The bike was a mid 80s, 27" wheeled, 14 speed. With the rear wheel's freewheel removed there is not enough room to spin on a Dura-Ace cog and a BB lock ring. The cog fits ok, as will a BMX freewheel. Are there cogs that are thinner in width than the Dura-Ace?

This is the second time I've come across this situation.

Adker

jeremyk

11-22-04, 07:25 PM

I'm not sure of the quality, but I have a Surly cog that fits with a BB lockring (lockring only had like two threads engaged, but better than nothing) on a hub that was too shallow to accept a DA cog and a lockring. Good luck!

edit: I seem to remember someone telling me that Surly is changing their cogs to widen the base...maybe look for an old one?

baxtefer

11-22-04, 07:36 PM

no, different brands have differnet withdths and differnet chainlines.
once again Sheldon Brown comes to the rescue:
http://www.sheldonbrown.com/chainline/#chainline1