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Does this mean 1/8” outer and 3/32” inner as the listings are in mm not inches?
3 / 32" (2.4mm) refers to the width of the rollers of the required chain which is the same for both sprockets. The thickness dimensions of the sprockets given in the document are measured near the hub -- the smaller outer sprocket will narrow from 3.1mm when approaching the teeth to accommodate the chain.
Nick_S
Thanks for your response.
I should have made it clearer l am looking at the two speed derailleur only option here so no hub gear attached.
Looking at the spec document for 2 spd derailleur the outer cog should be at 3.1mm and inner cog at 1.8mm.
Does this mean 1/8” outer and 3/32” inner as the listings are in mm not inches?
I have ordered a standard 13 / 16 to see what l am supposed to be working towards then go from there.