Silverado Tire sizing.....

Im looking to drop my 06 silverado 4/6 for right now Im wondering what size tire would i go with that will look right..I have ordered a set of 20x8.50 wheels with a 5.4 backspacing.. Can someone help me out on this one.... Tuckin18s@yahoo.com

on my 97 im rollin 255/35R20's they look good and dont quite rub, ive done the 4/6 drop....

255-35 or a 245-40 would prolly work

If i was to do a 255/35/20 thats like 27inches and my stock 245/70/17 is 30.5inches tall Will that screw up my milage or can that be fixed?? Thats 3.5inches pretty big difference

it will mess with the mph and the miles added tot he truck but you can fix it , just have your computer recalculated to that over all hieght

im running 255/35r20s the front of mine is bagged but the rear is just lowered the pic is kinda old its alot lower in the rear but it gives u the idea

i rocked 255's until i bagged it then i went 245's. but i had a little more b.s.