Helix Racing Products Heavy Duty Chain Roller Large, Part #177-56
Helix Racing Products Heavy Duty Chain Rollers (large) with Sealed Bearings are designed for most On-Road or Dual Purpose Bikes. These can also be used on Off-Road Bikes. Width: 29mm. Outer Diameter: 41mm. Inner Diameter: 8mm. Includes 608Z Bearings. Made in America.