I would recommend if you are a serious rider, primary transportation is your bike, do not use the OEM wheel bearings, you can get a lot better quality from the aftermarket, and if you shop around probly a lot cheaper too, and if you want to get real serious, find you a '10 model rear wheel, they added a 3rd bearing on the pulley side, the low end torque of these bikes is hard on the bearings, not really disturbing, as with all things mechanical, keep an eye on it, tighten the loose bolts, when you wash it, do a decent inspection of it, almost all the bearing failures, mine included, gave a good bit of warning, in my case they were clicking/ticking, for almost 2 weeks before the failure