Thanks to the new Dura-Ace R9100 crankset's ingenious spider design, both inner and outer chainrings share a common BCD. This means that the lighter, stiffer Dura-Ace FC-R9100 Chainrings are one-size-fits-all, as long as you're working with a new Dura-Ace R9100 or R9100-P crankset you can switch out chainrings to your heart's content.
The Shimano Dura-Ace FC-R9100 11-Speed Chainrings is available in a variety of sizes for inner and outer ring applications.
Inner Ring Sizes:
- 34 tooth.
- 36 tooth.
- 39 tooth.
- 42 tooth.
Outer Ring Sizes:
- 50 tooth.
- 52 tooth.
- 53 tooth.
- 54 tooth.
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