SRAM Dub Left Rival Power Arm/Spindle E1 172.5

Upgrade your existing Rival E1 crankset with spindle based power (NOT FOR DUB WIDE XPLR CRANKS)

Spindle-based unit measures left side power to calculate total watts

Long battery life (400+ hours) to power a season of rides

User replaceable lithium AAA battery

Lightweight (less than 40g heavier than standard crankset)

SRAM Model ID: PM-RIV-ASSY-E1