Ace AF1 LOW 55 Polished skateboard trucks. Lightweight hollow kingpins. Manufactured with high-quality AA 356.2 alloy using our own proprietary casting method. Lowered 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. 10mm 91a top bushing. 12mm 86a bottom bushing. Durable Hand-poured 96a urethane pivot bushings for smooth as silk response. Refined bushing and cup washer shapes for a cleaner turn. Machine-faced hanger ends for precise bearing contact.t. Axle width: 8.5” (215mm). Hanger width: 5.8” (149mm). Truck height: 49mm. Fits boards: 8.3” - 8.75”. Weight: 12.9 oz.