Sram Force 1x AXS D2 Power Meter Spindle DUB 175x40 DUB crankset blackIts the best of both worlds. A light and stiff direct mount chainring with accurate Quarq power measurement elegantly hidden inside the DUB spindle lets you stealthily gather the data you need to progress. DUB PWR spindle based unit measures left side power to calculate total watts Long battery life (400+ hours) to power a season of rides User replaceable AAA lithium battery DUB bottom bracket adds durability and simplicity Waterproof (IPX7 waterproof