This 4 speed Rear hub takes a 13t rear sprocket and 4th is 210% of first ..Sturmey-Archer | X-RF4

like the 8 speed tcs mentioned Sturmey-Archer | X-RF8 the 1st gear in the hub is direct 1:1

but the smallest cog size , on it is 20t, top gear is 325% of first ..

get your Math On..




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