This is a Shimano part not made by Chris King Precision Components
-This is required for R45D Centerlock rear hubs
-SM-HB20 (Shimano Part Number)
-Shimano/Chris King
-Alloy
-CenterLock
-The only lockring that is compatible with Chris King Centerlock rear hubs. The inner diameter of the SM-HB20 is large enough to fit over the bearing adjusting clamp.
-Available for Pickup within 2 to 1 businesses days