• 12 sprockets out back, obvs
• Wireless communication between shifters and derailleurs; derailleurs are still wired together and to battery
• 11-34 and 11-30 Hyperglide+ cassette options
• 54/40, 52/36 and 50/34 chainset options
• Faster shifting: 58% improvement out back; 45% up front compared to Dura-Ace 9150
• All the 'brains' and charge port now in the rear mech; no more junction box/ANT+ adapter
• Shift button offset increased
• Smaller remote shifter buttons compared to Dura-Ace 9150
• Redesigned brake hood shape
• New tubeless carbon-rimmed wheels with aluminium freehub bodies in 36mm, 50mm and 60mm depths
• New quieter freehub engagement mechanism with quicker take-up
• New rear hub spline pattern, but compatible with previous 11-speed Hyperglide
• Increased pad clearance in disc brakes
• Rim brakes still available in theory, but will likely be very hard to find on new bikes
• Easier hydraulic brake maintenance
• RT-MT900 rotors from XTR mountain bike groupset now standard on Dura-Ace

• Dura-Ace and Ultergra are now 12-speed.
• Both ranges will only be offered in the electronic Di2 format.
• Both provide wireless cockpit shifting options.
• Ultegra gains an optional dual-sided power meter.
• Dura-Ace can now accommodate a 34t largest sprocket.
• New race-focused 54/40t Dura-Ace crankset introduced.

• 11-30t: 11, 12, 13, 14, 15, 16, 17, 19, 21, 24, 27, 30
• 11-34t: 11, 12, 13, 14, 15, 17, 19, 21, 24, 27, 30, 34

• Shimano Deore M6100: 12-speed, 1x only
• Shimano Deore M5100: 11-speed, 1x and 2x options
• Shimano Deore M6100: 10-speed, 1x and 2x options
• 
  

RX800 Shimano Ultegra level and 11-speed. You can get mechanical and electronic (Di2) setups.

48/31 - 42t - 40t 

RX600 Shimano 105 level and mainly 11-speed (although there is a 10-speed RX600 chainset too). Shifting is mechanical only.

46/30 - 40t

RX400 Shimano Tiagra level and 10-speed. Shifting is mechanical only. 

46/30