The Redline Microline 2-pc BMX cranks are lightweight race cranks featuring cold forged 6061 aluminum arms with laser-etched Redline logos, large recessions to save weight and a built-in 110mm 5 bolt spider. The GXP style 24mm hollow chromoly spindle is Isis drive and comes pressed into the drive-side crank arm for increased stiffness. The GXP system captures the non-drive side bearing between the spindle and crankarm, allowing the drive-side bearing to float on the spindle. This system requires zero bearing side-load adjustment and is much easier to install. Includes sealed 68mm external Euro BB.