To fit (not all) buggys cars and trucks with a 12mm hex. High grip/traction wheel and tyre with high impact hardened plastic structure to ensure a long lasting wheel. Please check measurements below before ordering to help ensure a fit: Tyres will require gluing to the wheel before use. Front Set: 88mm External Diameter. 47mm Internal Diameter. 36mm Width. 12mm hex. Center hole diameter 4mm. Depth to 12mm hex is 15mm. Rear Set: 88mm External Diameter. 47mm Internal Diameter. 40mm Width. 12mm hex. Center hole diameter 4mm. Depth to 12mm hex is 15mm.