I had the 30" BFG AT/KOs. Fine tire, but my rims are a lot more scraped up due to the narrowness of the tire. I went with the 31" BFG AT/KOs now and am much happier. Aside from the very minor plastic trimming there are no negative side effects. They are 1.2" larger in diameter than the 30" BFGs, so the extra .6" of ground clearance is nice. If you are just a poser they look better too!