30 / 46 teeth, 2x, Hollowtech II, without bottom bracket, black SB-packed, 10-speed compatible, bolt circle 80 / 110 mm Crankset from SHIMANO The GRX crank from SHIMANO is available in 172.0 mm. Made of aluminum, the crank is particularly durable and lightweight. It features two chainrings, with 30 teeth on the small and 46 on the large. If your bike has a Hollowtech II bottom bracket and a 10-speed drivetrain, this part is a perfect fit. Number of chainrings 2 Crank length 172.50 mm Main color black Large chainring 46 inch Small chainring 30 inch System compatibility 10-speed Bottom bracket Hollowtech II Type/kind Item Variation crankset