Since I've owned my 525, the left (sprocket side) rear rim has worked loose on two different occassions. Both times, the wheel center has been ruined due to the studs eating into them once the lugs worked loose. I always tighten the lug nuts very snug and I checked them beforehand both times this happened (I know this is the first question everyone asks). I'm curious how this could have happened to the same side with a totally different hub, wheel, and lug nuts each time it happened? Is there something that could cause the one side to loosen up more than another? Maybe vibration or torque or tire type? I'm running dual beadlock hipers w/ razr2's BTW, and I've never had this problem with any other atv that I've owned. I'm completely baffled. I'm almost to the point where I'm about to loctite my lug nuts.