Shimano

Shimano Compatibility:

Model 921 - Ultegra 8100 Di2 & Dura Ace 9200 Di2 
Max Cassette: 34T
  
Model 891 - Ultegra 8000/8050 & Dura Ace 9100/9150
Max Cassette: 34T
  
Model 105 - Shimano 105 / 7000
Max Cassette: 34T