I just noticed that Skat-Trak has a bulletin board where you can ask questions about their paddle tires. And they seem to be pretty good about answering people's questions. Check it out...
http://www.skat-trak.com/cgi-bin/ubbcgi/ul...i?ubb=forum&f=2

yeah, I've been looking at that for a while now and they do answer questions helpfully and rather quickly