I am about to buy new tires. I have doubt between michelin T63 and Continental TKC80. I am driving 60:40 on road and off road. 1. Can somebody recomend according to his exporience? 2. Is it possible on xt660z to be used, maunted Rear Tire 140/80-17 (TKC80)? Have somebody expirience with wider 140 rear tire? Thanks in front...