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Surly Single Cassette Cog 3 32" Splined 21t ModelNumber=E4687 saddle clamp MFPN=6228 saddle clamp Roto handle with hexagonial drive shaft and protection cover that fits 100 mm wide Swix Roto Brushes Photo for color and material reference only Tooth Count 21 Cassette Body Type Shimano HG 7 Speed Drivetrain Speeds Single Speed 3 32" Material Steel Multi gear use will result in slower less crisp shifting than cogs designed for multi gear systems
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