NEW Problem Solvers Singlespeed Cog 21t fits Problem Solvers Carrier or 6-bolt hubs qbp Compatible with Shimano 9-Speed STI

Compatible with Shimano 9-Speed STI levers

TCS Light/Fast

Magnetic resistance unit provides a quiet and frictionless ride

Chainring BCD: 110 SRAM Asymmetric

Crank: e*thirteen Plus Alu

NEW Problem Solvers Singlespeed Cog 21t fits Problem Solvers Carrier or 6-bolt hubs qbp Compatible with Shimano 9-Speed STIProblem Solvers Singlespeed 6 bolt Cogs are designed to be used with the Problem Solvers Cog Carrier. Compatible with 3 32" and 1 8" chains Cog is also 6 bolt rotor mount compatible for fixed gear use (see instructions for applicable warnings) Tooth Count: 21 Cassette Body Type: Single Cog Driver Defined Color: Silver Material: Steel Drivetrain Speeds: 1