Durable all-purpose truck for any type of skateboarding. 55mm tall for optimal performance and wheel clearance with wheels 56mm and under. A356 T6 Aluminum Hanger & Baseplate. The best lightweight aluminum alloy heat treated to T6 condition for strength, durability, and grind feel. SCM435 Chromoly Steel Axle for the highest quality and durability available. Grade 8 Kingpin. 159 and 169 models feature 6 hole universal baseplate with old and new school mounting pattern.