Matco 5″ cast aluminum wheel, brake and axle assembly offers light weight, superior strength and corrosion resistance. Uses 1-1/4″ tapered roller bearings. Wheel width: 4.5″ with a 3.084″ bearing spacing. Includes dual brake assembly with the following ratings: Static capacity 1420 lbs, Load limit 4260; kinetic engery 283,613 foot lbs. Wheel requires tube with 90 degree valve. Axles is 2024-T3/T4 with 1.946″ bolt hole spacing and mounting hardware. Total weight of wheel/brake and axle assembly is 6.1 lbs. As used on Kerkut & E-Racer. Kit consists of 1 wheel/brake/axle assembly and axle mounting hardware.