Our bot doesn't look scary until it drives. While it may appear 'tippy', the CG of our bot is just a few inches above the bumpers.
Our 6 wheel drive (6" diameter by 2" wide wheels with blue nitrile inclined belting) combined with our 2 3CIM ball shifters with ratios of 1:7 and 1:18.75 give us so much torque our robot can pop wheelies
Our reveal video:
http://www.youtube.com/watch?v=zfgvXcCyOnI