Durable, high performance truck for all types of skateboarding. 356 T6 Aluminum hanger and baseplate, solid Chromoly steel axle, grade 8 kingpin, Indy cushions with cylinder bottom. Featuring superior turn and stability, better grind clearance, improved no hang-up yoke for grind tricks, and less wheel bite. They last longer and are stronger on impact than any other truck on the market. 55mm ride height. Standard 4-Hole Baseplate. 139s measure 8.0" from axle tip-to-tip. Recommended deck size 7.75" - 8.25". Includes 2 Trucks.