Ritchey logic v2 headsetritchey strive for at least 2 x the standard laid out by cen the european committee which determines minimum safety standards for bicycles and components sold in europe by the time you put a ritchey product on your bike it has passed a global testing and approval process second to none features logic small upper angular contact bearings save weight larger lower bearings boost strength and durability uses ritchey grease size 1 18 stack height 30 2mm upper con