Arm Material Unidirectional Carbon Chainring Material SRAM Red PG Chainrings with Anodized Coating, Alloy Chainring Bolts Vægt 884g w/ BB Arm Længder 170mm, 172.5mm, 175mm, 177.5mm Gearing 53/39 Hoved enhed Garmin® Wireless Technology Latest Industry Standard, ANT+ Wireless Protocol