Originally Posted by Barrettscv

I've installed both a 48/31 Shimano GRX chainset on a disc brake bike, my Canyon Endurace. I've also installed a 46/30 Absolute Black oval chainring set. I used a Shimano Ultegra 6800 crankset with the Absolute Black rings on a rim brake bike with SRAM Red eTap 2x11 drivetrain.

The Absolute Black chainring set worked well enough but had a few issues. The chainrings are set inward toward the derailleur providing a chainline that is different than OEM but not really a problem. I had to use all of the adjustment on the inner set screw to position the derailleur cage correctly. I found that the shifting of the chainrings was a little more fussy than the OEM chainrings and was audibly louder than OEM. I also dropped the chain once a day.





I transferred the chainrings and crankset to an Ultegra 6800 drivetrains and had far fewer problems. I don't think the Absolute Black chainrings were a good match with the electric shifting but was very good with Shimano mechanical shifting.

You could try to install the GRX crankset on a rim brake bike, it will install without modifications needed. You will need to use the matching GTX front derailleur. The chainline on the big-big combination will be extreme and should probably be avoided.