I gotcha. Well, this no name swinger that I have has been up several steep hills, off many jumps, and flys through the trails. Like MJ said, the bearings take a beating because of the extra pressure on them. I have a +4 axle, so mine takes a little more. I just replaced mine a couple weeks ago. But, bearings are like $30, and it takes about 30 minutes to replace them. I just drilled my carrier and put a zerk fitting in it, so I can grease the bearings. You just remove the inside dust cover on the bearing itself. They should last alot longer, actually getting greased on a regular basis.