Stage 4s boast modern materials and processes for superior durability and longevity compared to others. Choice of 136mm (8.0in), 146mm (8.375in), 151mm (8.625in), and 166mm (9.0in) sizes with a 55mm height for optimal performance and wheel clearance with 56mm and under wheels. A356 T6 aluminum hanger and baseplate, SCM435 chromoly steel axle, plus Grade 8 kingpin and 90a Original Cushions with printed bar logo are used for strength and durability. Features 6-hole, universal baseplate with old and new school mounting patterns. Proudly Built to Grind and Guaranteed for Life.