This Outer Chainring can only be used with Shimano 105 FC-5800 11spd Double Chainsets with a 50-34T set up.
If the correct Outer Chainring is unavailable you can also use the chainring from the following chainset:
- Shimano Ultegra FC-6800
This is a "B" match which indicates that the parts are usable, but differ in materials, appearance, finish & size etc.
Genuine Shimano replacement part.