Suntour has licensed from WTB the Grease Guard injection system for the XC PRO headset. This headset however uses loose ball bearings not held in a retainer. The headset has cast aluminum cups and four brilliantly conceived rubber stem seals that close off the bearings against outside dirt getting in, while providing a passageway for purged grease to exit through. In the lower bearing assembly, the cup is then turned to make sure the inside and outside are perfectly round. The steel head key washer is recessed into the upper bearing cup. Both cups are machined to accept the steel bearing races that the balls revolve on, then they are anodized Black. Into the cups are fit precision ground stainless steel races. The fork cone race is made of stainless steel and ground to a smooth finish. The upper cone race is steel which is chrome plated, and then given a precision ground bearing surface. The head lock nut is made of aluminum. There are twenty- six 5/32" ball bearings in each of the bearing cups. The Grease Guard port on the side of each cup allows you inject grease into the bearings and push out both water and contaminated grease conveniently. You do not have to disassemble the headset, it can be done on the bike, very simply, at the end of any aggressive ride. The XC Pro headset is available in 1" diameter. The 1" headset has a stack height of 37mm. The 1" size weighs 125 grams. Black only. No longer made, we sold these for