The Rival XPLR AXS E1 Power Meter is SRAM's most affordable spindle-based power meter crankset for gravel and adventure bikes, measuring left-leg power with ±1.5% accuracy and doubling that reading to estimate total output. It sits below the carbon-armed Force E1 XPLR in SRAM's gravel power meter hierarchy, trading the carbon crankarms for forged aluminum to bring the price down while keeping the same power measurement unit inside the DUB spindle. If you're building or upgrading a 1x gravel setup with SRAM's newer Full Mount rear derailleurs and want onboard power without stepping up to Force or Red pricing, this is the entry point.

The power unit lives inside the DUB spindle rather than in the crankarm or spider, which keeps the crankset looking like a standard alloy crank and adds less than 30 grams over a standard spindle . Battery access is tool-free from the non-drive side, and a user-replaceable AAA lithium cell delivers 400+ hours of runtime — enough to cover a full season without thinking about charging. The unit is rated IPX7 waterproof, supports both ANT+ and Bluetooth SMART for pairing with head units, and carries a 2-year warranty .

Compatibility is where you need to pay attention. This is the Wide version with a 47.5mm chainline designed to work with SRAM's Hangerless Interface drivetrains , meaning Full Mount rear derailleurs that bolt directly to a UDH-compatible dropout. It's compatible with SRAM AXS 12- and 13-speed drivetrains and runs Eagle, T-Type, or Flattop chains . It will not work with road cranksets or 45mm road chainlines, and SRAM specifies use with XPLR derailleurs on frames with chainstay lengths down to 415mm .... Read More