Compatibility
- Shimano Dura-Ace R9100, R9120, R9150 & R9170 Di2
- Ultegra R8000, R8020, R8050 & 8070 Di2
- Can be retrofitted to 9000 & 6800 series cranks
What size should I choose?
- 34T inner chainring should be used with 50T outer ring
- 36T inner chainring can be used with 50 or 52T outer ring
- 38T inner chainring should be used with 52T outer ring
- 39T inner chainring should be used with 53T outer ring
If you wish to use another configuration it will work, but shifting will be slower and may require more adjustments of the front derailleur to be acceptable. Also remember that front the derailleur can only accept a maximum 16T difference between the two chainrings. Absolute Black always recommends using a new chain when fitting new chainrings.
