Ihave a Jato and put some mean knobbies on it and it absolutely SCREAMS through the grass w/ no problems at all. Never gets stuck, runs 45 mph plus on grass, throws roosters about 10 feet, and pulls wheelies like mad. Look at pro line Dirt Paw for rear and Dirt Hawg 1 for front. Part #'s 1043-00 and 1071-00. Go to www.prolineracing.com-products-race and all terrain trucks-tires. I am happy with my set-up.