How to Use the Calculator

The Crawler Innovations foam calculator was created to display all the foam options available for your application, arranged from softest to firmest. Rock Crawlers tend to perform better with the softer end of the foam spectrum in order to have forward bite while still controlling side wall flex. Trail Runners tend to perform better with the firmer foams that hold the shape of the tire at higher speeds but still give support to the tread as needed. Lil Nova 1.55, 1.7, & 1.9 - 4.0 all use the same outer, it's the closed cell inners that are different sizes. Lil Nova 4.25, 4.50, 4.75 all use the same outer, it's the closed cell inners that are different sizes. Double Deuce 5.0 & 5.25 use the same outer, it's the closed cell inners that are different sizes. Double Deuce 5.5 & 6.0 use the same outer, it's the closed cell inners that are different sizes. Essentially the foams are controlling the air pressure in the rc tire. The outer is controlling how quickly the tire responds, while the inner is supporting the overall tire and tracking of the rim.