RC4WD Z-T0012 Rok Lox 40 Series 3.8 Comp Tires FEATURES: Advanced X3 soft and sticky compound Reinforced sidewall support.;INCLUDES: Two Rok Lox 40 Series 3.8 Comp Tires with Foam Inserts.;REQUIRES: Wheels such as the RC4WD Z-W0010 or other manufacturer's 40 series specific narrow wheels such as the Pro-Line 40 series Cheyenne Narrow. Wheel #2683-01 For the Traxxas Summit order the Axial AX8017 wheel AXIC8017