PREORDER — EXPECTED NOVEMBER 2026 Fully refundable until shipped.
The REX XM-4 brings prehistoric personality to kid-powered play. A sharp-toothed emerald dinosaur, jagged REX lettering and subtle lime scale texture transform the proven Prime XM-4 into a kart young dinosaur fans can instantly claim as their own.
Matching emerald seat-edge graphics and coordinated dashboard and rear artwork complete the package while the factory chain cover remains unchanged.
Superior Karts Custom Series. Developed in collaboration with River City Play Systems and Prime Karts.
Verified XM-4 specifications
Recommended ages: 4–12
Maximum rider weight: 130 lb
Four-position seat; 12-inch seat height
Heavy-wall steel-tube frame
Air-filled tires
Coaster brake and reverse
Adult assembly and supervision are required. Use on level surfaces and follow the manufacturer’s manual.
Preproduction images shown. Final appearance may vary.
