Hey guys I have a 96 2dr. tahoe ,I have the stock 16in rims with 265/70/16 tires, I was thinking about buying rally rims with derby caps ,but only found them in 15x7 or 15x8's in 6 lug, would this be a problem if I get them as far as axle ratio,and should I get the 15x7 or 15x8's .also will I have to make any changes to the brake cal. My stock rims/tirs measure 30in in height if I do get the 15 in rims what tire size would u suggert 31's.thanks