SRAM RED AXS 2x Power Meter Chainring Kit - 54/41t 2x12-Speed 8-Bolt Direct Mount BLK/Silver E1 D640 the XP4's lithium-ion battery is

the XP4's lithium-ion battery is certified to UL 2271

navigating city streets is effortless

Our signature self-developed SegRange™ technology extends the range

similar to an anchor gripping the earth

SRAM RED AXS 2x Power Meter Chainring Kit - 54/41t 2x12-Speed 8-Bolt Direct Mount BLK/Silver E1 D640 the XP4's lithium-ion battery isIts the ultimate in integrated power measurement. The RED AXS power meter kit adds Quarq technology to SRAM's one piece chainrings for the lightest stiffest and most accurate power package available. A 13 tooth delta on all chainring pairs ensures precise shifting for any setup as well as a less dramatic change in cadence during front shifts. Combined with our most durable chainrings ever its an unbeatable combination. X Range gearing technology gives