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An important aspect of bicycle maintenance is to grease the "bicycle wheel bearings" . This helps to avoid costly future repairs and give you a much smoother, more comfortable ride. The wheel bearings are between the cup in the wheel hub and a cone screwed to the wheel axle.

Although adjusting QR force is a safety consideration, it is also one of bearing life. It should be kept at a constant level once the desired closure force has been determined. Rear vertical dropouts require a lower and more predictable closure force than was formerly required with axles that could move forward from chain tension. Because vertical dropouts do not rely on friction to bearings resist chain load, many hubs now have smooth faced jam nuts that do not damage dropout faces as older knurl faced ones did.

This is later. Bicycle wheel bearings come nicely snug into crowns these days, but sometimes you still find some that are just put loose in the wheel hub. To avoid all of them crashing to the ground with the possibility of vanishing for ever, grab the axle on the side that is still locked in place and point the end that you've just loosened,up. Now it is time to unscrew the locking nut almost completely off the axle. Next, unscrew the bearing cone to expose the wheel fag bearings to the light of day. Any grease in there? You'd be surprised on how often I open up brand new bikes and find almost nothing.

You asked for it, here you have it. Wheel bearings on a bicycle are an important part of bicycle maintenance and by making sure that everything is well lubed in there, you can avoid costly bicycle repair down the road. Well lubed bearings also provide an easier ride.

The wheel bearings sit between a cone screwed to the wheel axle and the cup in the wheel hub. They must be properly adjusted and greased. To find out if everything is ok without taking everything apart, simply remove the wheel from the bike and turn the axle with your fingers. Everything turns nice and smooth ina bearings without any play? Good, then you probably don't have to worry about anything. If the axle is stuck, very hard to turn or is very loose, you have to regrease your bearings propbably anyways. 

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