[JThiessen]

Seems to me that when you ran the calculator, your balloon factor was a little low - I'd plan on .5 to .75 with those tires.
Someone else correct me if I'm wrong, but his numbers showed about 36K rpm. I try to hit the low to mid 40's for rpms.

Your right - trucks are meant to have big tires. Go have fun with it, quit worrying about everything you read. You'll find that 90% of internet posters are the one that are having a problem. The vast majority - those who dont have issues - dont bother to come on forums and read/post/learn. You've started to ask the right questions, and by using the caluculator, your now one more step further in understanding the parameters involved in making these things work, and, as we've all experienced, dont work. Everyone of us who have lambasted this guy have at one time burnt up a motor or esc or blew up a battery 'cause we did something stupid.