I stopped by East Bay Tire (Fairfield, California) yesterday to look at their STA tires. I want the 8-17.5s like came on our truck (still need help finding the rims) but if I cant find the 17.5s I will have to stick with 16s we already have - similar to the 7.50-16 shown.
Both tires look great if you like the tall skinny maximum traction type of tires. Here are some pics. The 8-17.5 has a very distinct center grove and the 7.50-16 have a more aggressive knob tread but no center groove. They're both about the same outer diameter but the side wall is taller on the 7.50-16.
Here is a link the the STA web page -
http://www.stausaonline.com/light-tr...r-traxion.html The 17.5s are sold as Fig "B" and the 16s are sold as Fig "A" on this page.