Shimano GRX Chain Rings on Ultegra crank

Triathlon Forum
1

Good morning,

I am interested in a pair of GRX chain rings, they are 48-31T 4-bolt. Wondering if they will fit on my existing DuraAce 9100 and/or Ultegra 8000 crank arms. I am reading conflicting information. Does anyone have experience with this?

Thanks

2

The inner ring will not fit. It mounts to a smaller set of bolt holes on the inside of the crank, which is an 80mm BCD. Outer ring and standard Shimano road 4-bolt is 110mm BCD.