The DS Racing Mini-Z 8.5mm Front and 11mm Rear Drift Tires are designed to give you a performance driven tire for optimal drifting. The combined narrow front tires and wide rear tires are designed to mount to 20mm wheels (sold separately). Available in multiple compounds to best suit your driving surface. Compound Chart: MI-LF5: The most slippery on every surface MI-LF4: Slippery on carpet MI-LF3: Slow speed for hard surface / Medium speed on carpet MI-LF1: Medium speed for hard surface MI-F5: Terrazzo and Marble surface