This is not an economy tire! - The IRC TR-11 offers many of the same performance features as the Michelin, and uses a slightly harder side wall compound to reduce the potential for punctures. Radial construction has a dual-rubber compound. A softer rubber is used for the tread, while a harder rubber is used in the sidewall to increase the strength and give the tire incredible grip and handling capabilities. If you experience frequent punctures, then the IRC is a great alternative. 4.00" x 18" 4 ply, radial design.