* Upgrade standard (non-Wide) Rival D1 cranksets to power meter cranksets.* Replaces non-drive crank arm and spindle. Uses existing drive side arm and chainrings.* DUB bottom bracket adds durability and simplicity* DUB-PWR spindle-based unit measures left side power to calculate total watts* Long battery life to power a season of rides* User replaceable AAA battery* SRAM Model ID: PM-RIV-ASSY-D1