I am trying to understand an issue I keep running into wile trying to pick tires for my mud truck. I want to run different tires up front than I do in the rear. The tires I want to run in the rear are 33x14-15LT Boggers, as for the front I don't really care what thy are as long as they are taller, narrower, and less aggressive. I want to do this to create a slight under drive in the rear end. Given that the boggers only measure 32.7" tall, I would think all I had to do was find a set of 33's for the front that measured 32.8" or taller. But as I look at the revs per mile the Boggers, LTB's, and TSL's tend to have a lower number of revs per mile than any other tire of the same tire height. Can someone please explain to me how a 33.7" tall bogger would spin less times per mile than a taller tire in a radial ply?