There is a picture on traxxas.com showing the tire size, I can't port it over so someone else will have to.
http://monster.traxxas.com/showthread.php?t=470574
about the 20th pic down, the tire size is 3.8x1.8x2.0 I assume inch and the rim is 2 inches
Work because i gotta, play because i wanna
People here hate Nitro, I love it. I start it, run it about 50 ft from me and it dies, I go after it. Perfect exercise