Some call this OverSize, C-Bear simply calls it Original Cage Max, C-Bear Ceramic OCM. 
C-Bear Ceramic Aluminum Shift Wheels with full ceramic bearings for Shimano 10/11-speed rear derailleurs. Shifters are the fastest rotating bearings on your bike. Upgrading to ceramic bearings is therefore the most effective upgrade. 
C-Bear Ceramic Bearings is a Belgian bearing specialist for ceramic ball bearings with best smooth running properties, durability and fitting accuracy. All bearings work without additional spacers and washers.
Note: Not compatible with the 
2x C-Bear Ceramic derailleur wheels
| Activity: | Cycling | 
| Material: | Aluminium, Ceramic | 
| Item code: | CBE471046 | 
| Model year: | 2021 | 
| Manufacturer: | C-Bear | 
| Product name: | C-Bear Ceramic Bearings OCM Aluminium Full Ceramic Pulley Wheels for Shimano/SRAM 10/11-speed | 
| Usage bikesport: | Road Bike | 
| Manufacturer page: | https://www.c-bear.com | 
| Manufacturer item code: | pull-ocm-shi-fc | 
| Rear derailleur accessories: | Jockey Wheels, Tuning Parts |