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You can now build a 9-speed Shimano CUES road or gravel bike with hydraulic disc brakes - Cycling News
I have nothing against 9x drivetrains, up until last year I was still using my trusty 3x9 MTB setup. When it was time to finally retire that 30 year old frame, I started from scratch with a mix of GRX and XT components to have the best of both worlds for my long distance rig. That frame has thru axles and is built for Flat Mount calipers.
I wonder who the 9x Cues disc brake components are for. Bikes that are equipped with disc brake mounts (especially those that came after IS 2000) are probably not very old and may be equipped with 10x or 11x components already. On the other hand, guys who have old 9x drivetrains and 135 mm rear hubs probably cannot mount the disc brakes on their older frames. What am I missing?