2B-6 or RS-62 on S10

Im finally going to 1/2" on my S10. I've got 2500# stone's in the front. Will i have to cut more to use a 2B-6 or RS-62? The inflated diameter for both is 6.8" on the 2B-6 and 6" on the RS-62. Whats the inflated diameter on a 2500 stone.