You can find the M/T tire guide info here:
http://www.mickeythompsontires.com/s...m=ETDragRadial
They have two different 30x9 radials, one taller, one wider. I always ran the 3066R (shorter 93", but wider, true 9" tire). 110 passes like clockwork, prints tickets, and was .12-.13 faster than the bias plys. Won a Bracket Finals, World Footbrake Challenge, and a Stock World Championship on these tires.
Only ran the 29.5x9's through one set. Also a good tire, but the 3066R's just fit my gearing better, and liked the extra tread width insurance.