Now available for the Baja 5B are these tough Molded Inner Foams for the front tires. Previously available only for the rear tires, this is the same high density black polyurethane molded foam that has proven to be extremely durable. Our testing showed a significant improvement in handling and steering feel when used inside the front tires, so we now offer them molded for a perfect fit on any of the Baja 5B front tires.
Some racers have also found that using the narrow Dirt Buster Block tires (4848, 4849) front tires & wheels on the rear of their buggies is an advantage on certain tracks, so these are also highly recommended for those applications.
Source : HPI