It is amazing how much Trinity wants their customers to do well. Kevin and Adam are a wealth of information and always willing to listen and offer help. Maybe its RC's best kept secret but the Monster Max is killing it in 17.5 and 21.5. I have owned Many different brands, but nothing was able to stay fast deep into a run as the Monster Max. Set it at 50 on the can, gear accordingly race and the smiles will soon follow.