Vortex V3 Motorcycle Tire Warmers for racing Works on: Front Wheels 16.5-17" Diameter, 3.5-4.0 Rim Width, 120-125 Tire Width Rear Wheels 16.5-17" Diameter, 5.5-6.25 Rim Width, 180-200 Tire Width NOTE :Min power source of 1100 watts suggested DuPont Nomex Inner liner/Melt proof design Carbon insulation/Better heat retention Dual Stage Neon Light/Shows when heating & ready Bungee Cord fitment system/Ensures good fit, easier to install Dual Temperature Setting/Simple adjustability/Positive Temp Control Evenly spaced heating element/Full coverage heating Creep action thermostat Silicone insulated 7 core heating element Felted Carbon Insulation Urethane backed ballistic nylon exterior.