The all-new ACE AF1 HOLLOWS features hollow axle and kingpin, making for the lightest AF1 to date. The AF1 is carefully manufactured using our proprietary casting process. Years in development, the ACE AF1 has a 70% increase in the aluminums structural integrity, making it the strongest cast truck on the market. 8.6% Lighter than standard AF1 Hanger width: 5.6 (143mm) Truck height: 2.1 (53mm) Manufactured with high-quality AA 356.2 alloy using our own proprietary casting method True T6 heat-treated baseplates and hangers SAE 4140 steel alloy axles, oversized to eliminate bearing wobble. Patent pending rethreading axle nuts – no more damaged axle ends! Durable Hand-poured 96a urethane pivot bushings for better response. Refined suspension for a cleaner turn. Top Bushing: 12mm tall | 91a hardness Bottom Bushing: Bottom 14mm tall | 86a hardness Machine-faced hanger ends for precise bearing contact.