525 R4 SRS - Road Chain - 120 Links crankbrothers core-refined nickel-chrome-molybdenum alloy steel for

core-refined nickel-chrome-molybdenum alloy steel for the ultimate combination of strength and hardness

A 100% proprietary blend of carbon and TR90

Embossed back panel cuff for simplistic comfort and modern look

Screenprinted BB33 and 100% logos

Size-specific enthusiast-level platform pedal provides optimal shoe/ pedal interface

525 R4 SRS - Road Chain - 120 Links crankbrothers core-refined nickel-chrome-molybdenum alloy steel forSpecially developed sealed ring chain utilizes Renthal's Self Regulating Seal (SRS) technology to increase the service life of the chain in road applications; also enhances chain flexibility for smoother operation