Originally Posted by fietsbob

when the sprocket turns the hub-shell at the same rate as itself, that is is the direct 1:1 gear

with a 3 and 5 speed , that is the middle one .

but their 8 speed it is the one on the bottom end

all the others the gear ratio multiplies from that gear size
wheel turns faster than the cog on the hub turns.


so say the chain ring is a 30t, the cog on the hub 23t, the external ratio is 1.3:1 [x the wheel diameter]

that will be the Low gear.



insert ..divided/or multiplied by, rather than vs,.. and that's basically it.