The 2013 Dirt Nitro Challenge winner is unleashed.   Metrix tire in multiple compounds now available.  Straight out of the JConcepts development department is a brand-new, clean slate 1/8th buggy tire design.    The Metrix, debuted during the 2012 IFMAR World Championships and used to victory during the 2013 Dirt Nitro Challenge, utilizes a stacked center tread, […]