Shimano SG-3C41 3-speed internal gear hub with coaster (back pedaling) brake.
Includes "Revo" twist grip shifter, cable and 19 tooth cog.
36 holes, 120 mm frame spacing.
3 speeds with a 186% gear range: 1st gear = 0.733, 2nd gear = 1.00 (direct drive), 3rd gear = 1.36
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