Well, it´s fairly useful if you live in a hilly country/area or you just do routes with different profiles time to time.
Plus in a fixed/fixed hub you can fit a SS cog, whilst in fixed/SS one you can´t run two fixed cogs (without risking your life).
@madman started
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Well, it´s fairly useful if you live in a hilly country/area or you just do routes with different profiles time to time.
Plus in a fixed/fixed hub you can fit a SS cog, whilst in fixed/SS one you can´t run two fixed cogs (without risking your life).