Problem Solvers Chain Tensioner (Two-Pulley) (Adjustable Chainline)
Problem Solvers Chain Tensioner (Two-Pulley) (Adjustable Chainline), Problem Solvers Single-Speed Tensioners Features: Two-pulley tensioner Adjustable chainline 18t maximum cog size CNC-machined AL-6061-T6 Not for use with fixed-gear drivetrains or coaster brakes Specs: ColorBlack