SRAM FORCE D2 1X AXS ROAD POWER METER SPINDLE DUB - 40T DIRECT MOUNT (BB NOT INCLUDED) It’s 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. So you can focus your attention on the stunning finish of the carbon fiber crankarm. FEATURES 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 to 1 meter for 30 mins) Lightweight (less than 40g heavier than standard crankset) SPECIFICATIONS Speeds: 12 BB Compatibility: All SRAM Road DUB BBs Chainring Size: 40T Crank arm length: 165mm, 167.5mm, 170mm, 172.5mm, 175mm, 177.5mm Chainline: 45.0mm BB Spindle Interface: DUB Chainring material: Aluminum Guard: n/a Bolt Circle Diameter (BCD): Direct Mount (DM) Crank arm material: Carbon Color (Crank arm): Iridescent Power meter: Yes Power Meter Type: Spindle