Shimano Dura-Ace FC-R9200 12-Speed Chainring - 54t Asymmetric 110 BCD BLK NJ MFPN=RS-40-17 ISO Width (mm) 30 ISO

ISO Width (mm) 30 ISO Width (mm) 31 ISO Width (mm) 32 ISO Width (mm) 33 ISO Width (mm) 34 ISO Width (mm) 35 ISO Width (mm) 36 ISO Width (mm) 37 ISO Width (mm) 38 ISO Diameter 622 / Road / 29" Labeled Size 700 x 30 - 38 Valve Presta Med 41-55mm

Barend size multi-position 110mm

Brake Type Disc Damping Charger Race Day 2 Damping Adjustments External rebound 2 position compression (open/lock) Crown Material Aluminum Rake 51mm Maximum Rotor Size 180mm Maximum Tire Width 50mm Primary Color Black Spring Adjustments Air pressure Spring Type Solo Air Steerer Tube 1-1/8-1

As a result you will see many bikes with exactly the same hanger

Shimano Dura-Ace FC-R9200 12-Speed Chainring - 54t Asymmetric 110 BCD BLK NJ MFPN=RS-40-17 ISO Width (mm) 30 ISOShimano Dura Ace FC R9200 chainrings are constructed with high quality aluminum and are compatible with FC R9200 and FC 9200 P 2x 12 speed cranksets. Asymmetric 110 BCD Compatible with HG 12 speed chains Color Black Ring Position Type Outer Tooth Count 54 Round or Oval Round Drivetrain Speeds 12 Chainring BCD 110 Shimano Asymmetric Material Aluminum Defined Color Black Size 54T