NEW Problem Solvers Singlespeed Cog 18t fits Problem Solvers Carrier or 6-bolt hubs groupset-speeds-10 Rear Derailleur: Shimano GRX RX812

Rear Derailleur: Shimano GRX RX812

Includes routable Garmin Cycle Map with popularity routing plus off-course recalculation and back to start

Classic design for replacement and repair

HG-X 10-Speed chain

NEW Problem Solvers Singlespeed Cog 18t fits Problem Solvers Carrier or 6-bolt hubs groupset-speeds-10 Rear Derailleur: Shimano GRX RX812Problem 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: 18 Cassette Body Type: Single Cog Driver Defined Color: Silver Material: Steel Drivetrain Speeds: 1