I've been getting a lot of flats on the back of my bike recently and yet I've checked the tire, etc and it seems solid. What kind of tires do you guys run on the rear? I want something strong and thick with good puncture protection and a long skid life. Sorry if this is hard to find. I've heard mixed reviews on the everlast tires and have considered gatorskins, but was unsure whether they were long lasting or just very puncture resistant. Thanks.