This Inner Chainring can only be used with Shimano Dura-Ace FC-7950 10spd Double Chainsets with a 50-34T set up.
If the correct Inner Chainring is unavailable you can also use the chainring from the following chainsets:
- Shimano Ultegra FC-6650-G
- Shimano Ultegra FC-6650
These are a "B" match which indicates that the parts are usable, but differ in materials, appearance, finish & size etc.
Genuine Shimano replacement part.