BOX COMPONENTS Maximus Cro Mo BMX Bicycle Handlebar highest quality 4130 chromoly proprietary 13-butted taper from 22.2  at the grip area to 31.8  across the lower bends 7 degrees of back-sweep and 2 degrees of up-sweep Meets or exceeds ENBMX Category 1 standards fit all stems with a 31.8  clamp diameter