Simply put there are a couple reasons, the LTB is a softer rubber material and for daily street driving will not last as long, Probably about 5-6K miles per set. The tread patterns is a little more aggressive and has minimal siping compared to the SSR and the Irok. Lastly, they measure a lot smaller than the rated size for a coulpe of their tires and larger for others. The 34†LTB measures a hair under 33†rumor as I have heard was when interco developed the mold for the carcass, it was initially supposed to be a 33†tall tire, but they accidently printed 34 on the side, so they just left it. their 33x12.5 tire measures a little tall and the 40†ltb and 47†ltb alsmo measure 1/2†- 3/4“ larger respectfully. Yet almost none of interco tires measure what they are rated.