Its the best of both worlds - a light and stiff direct mount chainring with accurate Quarq power measurement elegantly hidden inside the DUB spindleDUB-PWR spindle-based unit measures left side power to calculate total wattsLong battery life (400+ hours) with the user replaceable AAA lithium battery to power a season of ridesWaterproof - IPX7 waterproof to 1 meter for 30 minsLightweight - less than 40g heavier than standard cranksetDUB bottom bracket adds durability and simplicityCompatible with all road DUB bottom brackets172.5x40DUBBLKDirect Mount1x12UPC/EAN/GTIN: 710845891540