SRAM Red AXS 1x Aero Power Meter E1 Power Meter Crankset Speed: 12 Spindle: 28.99mm BCD: Direct Mount SRAM 8 Bolt 50 DUB 172.5mm Black RoadPower meter is fully integrated into the chainring for lighter weight and greater accuracy Power readings are accurate within + 1. 5% and arent affected by climate conditions during a ride Measures right and left leg power balance Ultra light hollow carbon fiber crankarms are 29 g lighter than previous generation DUB bottom bracket adds durability and simplicity SRAM Model ID: FC RED 1P E1 TECH SPECS BB Inclusion No Crankset Material Carbon BCD Direct