Ceramic Rear Derailleur Wheel Comparison & Compatibility
Updated 25-May-2022
Strummer offers two variants of ceramic pulley wheels: one with White Ceramic and the other, the Super CNC pulley, with Black Ceramic bearings. Both are hybrid ceramic bearings that offer smoother operation than steel bearings.
All Strummer pulley wheels can be installed on rear derailleurs with 4/5/6 mm diameter pulley bolts. Two included washers/bushings can be installed to ensure the proper fit.
The following are the tooth variants for each series:
| Rear Derailleur Pulley Wheel Variant(s) | Available Teeth(s) |
| Strummer® White Ceramic Pulley Wheel | 11T, 13T |
| Strummer® Super CNC Pulley Wheel with Black Ceramic | 11T, 12T, 13T, 14T |
To ensure the right fit with your rear derailleur, check for clearance before buying and installing. The following table will help you make an educated guess as to which variant might or might not fit:
| Super CNC Pulley Teeth Variant(s) | Outer Diameter | Narrow-Wide |
| 11T | 42 mm | No |
| 12T | 50 mm | Yes |
| 13T | 52 mm | No |
| 14T | 59 mm | Yes |
