Shimano Brake Adaptors | XTR SM-MA90 (for all Shimano 74mm-caliper brakes)

Shimano XTR SM-MA90 Brake Caliper Adapters—140/160 mm direct-mount forks and frames for 160/180 mm disc brake rotors.

• SM-MA90 series brackets are specifically designed for the new generation XTR-M985/988 disc brakes but can be used on all Shimano 74mm-caliper brakes

This adapter can mount a 20 mm larger brake disc on the front or rear wheel. The brake mount on the fork and the frame must comply with the post mount standard!

The adapter extends the standard brake disc size of the fork or rear triangle by 20 mm. Please check which post-mount variant is installed in your fork or rear triangle. Based on the standard brake disc size, the adapter increases the brake disc size by the specified information in millimetres.

PM5 = 140mm standard size
PM6 = 160mm standard size
PM7 = 180mm standard size
PM8 = 200/203mm standard size

• SM-MA90 series brackets are specifically designed for the new generation XTR-M985/988 disc brakes but can be used on all Shimano 74mm-caliper brakes
• These new adaptors are lighter, optimally machined, and even have areas drilled out to save weight
• Shimano Adapters are listed by: Rotor Size / Caliper Mount / Front or Rear / Bike Mount Tab / Mfg Part Number.
  
  
• For instance, a 160mm / 74mm / Front / 51mm IS / SM-MA-F160P/S
  • Rotor Size = 160mm
  • Caliper mount drill = 74mm
  • Bike location = Front
  • Mount on bike or fork = 51mm IS
  • Shimano's part number = SM-MA-F160P/S

Technical Documents:

• https://si.shimano.com/en/pdfs/dm/SMMA00A/DM-SMMA00A-01-ENG.pdf
• https://productinfo.shimano.com/en/compatibility/C-193

*Note: Images are for representational purposes only. Actual size/packaging varies with product type/size.

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