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We installed the S637 tires October, 2013. Since then we logged approximatly 4000 miles and they look like new. I've only added air one time at the beginning of the camp season. I do notice slight wear on one tire on the right side which I'm pretty sure is more trailer than tire. It took very little weight to balance them. Someone mentioned weight of the tire. If I recall the S637 was very close to the G614 and over 20 lbs heavier each that the Marathons I replaced! Looks like the price has come down since I bought them and at the moment would hesitate to get them again.
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