sram red axs 1x power meter spider xplr dub wide e1 - threaded mount 40t (bb not included): 1

All-new design with removable and replaceable thread-mount chainrings.Available in 38t-46t - power readings are accurate within +/-1.5% and arent affected by climate conditions during a ride. User replaceable CR2032 battery with 200-hour battery life.Measures right and left leg power balance. Ultra-light hollow carbon fiber crankarms are 29 grams lighter than previous generation, while DUB bottom bracket adds durability and simplicity. Waterproof (IPX7 waterproof to 1 meter for 30 minutes.)Features:Speed: 12/13Spindle: 28.99mmBCD: Thread Mount, 42DUBBlackRoad Disc