I know this has been posted many times over but I couldnt find the answer I was looking for. A while back I tried one of the Continental Gelande Sport tires, 110/90-19. Its an intermediate terrain tire and it worked great here in the eastern woods and strip mines of Ohio. I still think part of my being 300lbs has to help with traction too. Anyways, I was riding about a month ago on a cousins farm, was headed up a long hill with the bike pinned in 4th gear, I just clicked into 5th (which you Ohioans know there arent many chances to do that with) and I hit a square ledged rock, kind of like a stair step looking thing. Long story short I ended up with a hole in my inner tube and tear in the sidewall of the tire, so now its time for another rear. My bike always has a Michelin M-12 front, its simply the best that I've found. As much as I liked the Continental I was thinking of trying a Metzler MC-4 or MC-5, they both looked like nice tires and were priced well at around $65.00. Has anyone used either of these Metzler tires? They both look to be nice for the terrain they are intended for but I hear the MC-4 is really light, could that allow the 500 to spin it easier and spit knobs off quicker? I've been leaning more towards the MC-5 because of this. Any opinions? Thanks.