SRAM, Rival PM, Left Arm with Power Meter Spindle, Speed: 12/13, Spindle: 28.99mm, DUB, 175mm, Black, Road

Description

* Upgrade your existing Rival E1 crankset with spindle based power* 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