Which compound is best for your application varies from one car to another, and from one drivers style of driving to another driver’s style.  One drivers driving style and their vehicle might find the performance of the R10™ the best.  Another driver with the same car but different tires might find the R18™ best for their car.   Some variables are; is it going to be used for street, autocross, track day, road racing, or any combination of these? You can contact us or one of our authorized dealers to help you narrow it down the best setup.  Anyone you contact at G-Loc™ is a racer and track day enthusiast that have the technical knowledge and on-track experience to assist you.