SRAM Red AXS 1x XPLR Power Meter E1 Power Meter Crankset Speed: 12/13 Spindle: 28.99mm BCD: Thread Mount 42 DUB 165mm Black Road DiscAll new design with removable and replaceable thread mount chainrings, available in 38T 46T Power readings are accurate within + 1. 5% and arent affected by climate conditions during a ride User replaceable CR2032 battery with 200 hour battery life Measures right and left leg power balance Ultra light hollow carbon fiber crankarms are 29 grams lighter than previous generation DUB bottom bracket adds durability and simplicity Waterproof (IPX7