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@BrickMan
ah right! For MTB 1:2 used to be the target, so a 32t 16t would be ideal for plodding around normal stuff.
For road I assumed (sheldon strikes) 1:3 was the norm. but your 48/18 comes out more like 1:2.55-2.66 sort of ratio. Guess thats probably more sensbile as i'll be commuting up that reet big hill from river bank to muswell hill :/