275-30/19's will fit the rears fine, just slightly smaller cirumference than stock but within what's considered acceptable margins +/- 3%. I put Bridgestone RE960's in that size on mine. A little softer sidewall than the stock Conti's, just like the Vredesteins. The ride quality actually improved as a result, and the extra 8/10's width dids seem to improve traction a touch. Nice aggressive look too.