While judging at the last NBRCC Comp (March, 2010) I was paying close attention to each driver and their rig as they headed through my course.  It was awesome to see so many drivers who have made improvements over the season, both in driving technique and rig set-up.  But, there were also a few drivers who seem stuck in a rut, unable to improve and repeating the same mistakes ....

The most cost effective upgrade for and AX-10, or any crawler, is tires....