SRAM Apex AXS Wide Left Crank Arm Power Meter Spindle Assembly - 172.5mm 12-Speed DUB Spindle Interface BLK D1 Clamp Style-Std Rails It features SRAMs X-Dome architecture

It features SRAMs X-Dome architecture for ultimate strength and weight savings

Brake Caliper Type Post Mount Mount | Rotor Size 160 Post | 200 Rotor Mount | Rotor Size 140 Post | 180 Rotor

Dual seat spring suspension system between BabySeat and rack helps isolates child from bumps and jolts

0 Base does not include a Trail Doc but can retrofitted with the Trail Doc kit

SRAM Apex AXS Wide Left Crank Arm Power Meter Spindle Assembly - 172.5mm 12-Speed DUB Spindle Interface BLK D1 Clamp Style-Std Rails It features SRAMs X-Dome architectureSRAM Apex AXS Wide Left Crank Arm and Power Meter Spindle Assembly 172. 5mm 12 Speed DUB Spindle Interface Black D1. Accurate reliable power measurement is practically a requirement these days and the Apex AXS crankarm power meter upgrade is the easiest way to get precise power numbers. With the tech hidden inside the DUB spindle it fits almost any bike while remaining stealthy. DUB PWR spindle based unit measures left side power to calculate total