I went ahead and ordered a set of tires/wheels from Tower. I don't have a tire truer yet. I also ordered the 13 tooth pinion. so that will help a little on the bigger diameter. I won't really know where I am till I run the track.
BTW here is a link to some pictures and some video of the opening night. We were all invited to just come see the track and get acquainted. I think it is going to be great. It did seem a bit crowed with 5 stadium trucks running at the same time.
Ron
http://www.iowarctracks.com/topic.asp?TOPIC_ID=1330
This is the tires I ordered.
http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXCMC8