NEW Surly Cogs Driver and Single Cog Surly Single Cassette Cog 3/32" Splined 21t type_car-truck-racks 120mm travel Headset Zero-stack internal

120mm travel Headset Zero-stack internal cup

Prime 9 technology offers the same range as a 12-speed drivetrain

An updated shoulder harness with a multiple height adjustment system increase fit and a innovative suspension system cushions bumps and jolts

Replaces the brake noodle on linear-pull brake systems

Lightweight design with built in adjustments for fine tuning

NEW Surly Cogs Driver and Single Cog Surly Single Cassette Cog 3/32" Splined 21t type_car-truck-racks 120mm travel Headset Zero-stack internalSurly Single Speed Cogs. Designed as a singlespeed cog, but may also be stacked and used with 9 speed shifter. Multi gear use will result in slower, less crisp shifting than cogs designed for multi gear systems Fit Shimano freehub splines SCM 415 hardened chromoly steel Photo for color and material reference only Tooth Count: 21 Cassette Body Type: Shimano 7 Speed Material: Steel Drivetrain Speeds: Single Speed 3 32"