Ace truck AF1 - 55 - Inverted Kingpin Hollow Board fit = 8.3" - 8.5" - 8.7" (you can adjust the width by using more or less washers) Axle width = 8.5 " Attention: this is only one truck (and you need two trucks to ride your skateboard) The all new Ace AF-1 Inverted Hollow: Engineered for maximum durability, unrivaled performance, precision tuning and guaranteed lowest grind clearance of any kingpin on the market. At the heart of our design is a patent pending technology providing a more stable anchor point for the kingpin. Our innovative hollowed axle system and domed-out baseplate make it the strongest and lightest truck we've ever created. This cutting edge design sets a new standard for the future of skateboard trucks. Features: •Each truck includes bonus adaptor tool, 2 per set!. Place this magnetic adaptor in ANY skate tool, and you have an Inverted tool. The magnetic adaptor won’t fall out minimzing risk of loss. •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 | 94a hardness • Bottom Bushing: Bottom 14mm tall | 86a hardness • Machine-faced hanger ends for precise bearing contact. • Each truck includes bonus black Axle Re-Threader • Inverted Baseplates compatible with all AF1 and Classic Hangers. Use your existing Ace hanger, or purchase a new hanger of choice to complete your custom set of Ace Inverted. All Ace Inverted Baseplates sold on their own include Ace Inverted Bushings and recessed washers specifically made for Ace Inverted setups.