Shimano XTR FC-M985 Bicycle Crankset + Shimano SM-BB90-A BB Brand: Shimano. Model: FC-M985. Chainring: 40-28t. Crank Arm Length: 175 mm. Pedals Thread: 9/16" x 20F. Weight: 1283 grams box included. Add me as a favorite seller or keep an eye on my other listings as I will continually add hundreds of vintage bicycle parts from my personal collection. Feedback is appreciated – it lets me know you're happy with your purchase. 4580.