Took my rear wheel off for a tire replacement and this happened to catch my eye. It could be completely normal and I've just never noticed it before, is this gap on the right side normal? I put a socket on the bolts and they seemed pretty tight so I didn't try to torque them any more than they are.
Again it might be perfectly fine but has me curious enough to ask the experts before putting everything back together tomorrow.
the only time you have to worry is if the side plates are not flat, or if the bolts are not tight.
every 50,000 miles or so, check the bearings to make sure they're still lubed and in good shape.. really they should last 250,000 miles or more, but they may need a little dab of grease every 50k or so... other then that, its fairly maintenance free.