The spider design uses a proprietary thread-on chainring mount system which allows us to reduce weight and increase stiffness without compromising the ability to swap rings. SRAM Red XPLR Groupset ReviewThread Mount design is light, stiff and accurate, and available in 38T-46T+/- 1.5% accuracyUser replaceable CR2032 battery with 200-hour battery lifeBluetooth low energy technology and ANT+ wireless data transferMagicZero automatically checks and recalibrates your power meter as you rideNo cadence magnet required10K Temperature CompensationWaterproof (IPX7 waterproof to 1 meter for 30 minutes)AXSenabled for easy monitoring and firmware updates Effortless Resilience. Effortless Precision. SRAM RED XPLR AXS is our most advanced gravel group, featuring a 13-speed 10-46T range so youre always in the right gear. Precise shifts with tight jumps between cogs keep you in the gearing sweet spot, and the Full Mount derailleur that fits on frames with the UDH interfac