TIRE MAXXCROSS MX-SI REAR 120/80-19 63M BIAS TTDelivering improved performance in soft to intermediate motocross conditions, the Maxxcross MX SI is the latest model from the Maxxis MX line. Designed and tested in cooperation with 7X Supercross champion Jeremy McGrath, the all new MX SI gives motocross riders and racers an edge with superior traction in a wide range of conditions. Superior traction for consistency in rough conditions allows the rider to feel confident in any soft to intermediate