My LBS is now stocking Schwalbe tyres, just as I'm building up my new commuter. I've always done my commute on skinny 23s & 25s because my bikes haven't had clearance for anything bigger. This time I want to go fat, like 35-40c so which Marathon? Marathon Racer? Marathon Plus? or the (stupidly expensive) Marathon Supreme? Is there much real difference between them? I'd favour lower weight and lower rolling resistance at the expense of super puncture protection - anyone have a view to share?