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@Ced
Thread dredging a little.
but I'm interested in the concept of having 2 gearing on 1 wheel without chainging chain.
The idea is to have a 44/17 for road and 40/21 for polo
I have a double fixed hub. Is it worth getting one of those double cogs or am I better off buying an extra 21t cog but having to flip the wheel around (it means I can also keep a 1/8th chain)?
My chainring is dead so doesn't enter in the equation.
My question is really about chainline problems if you see what I mean.