youzguyz
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I guess I am going to put in my opinion.
Like GyroBob says, check it first. To make sure you eliminate any brake noise, remove the caliper (2 bolts, no big deal). Listen for noise at the hub, check for play in the bearings. (somebody holds the fork firmly and you try to wiggle the tire).
Any significant noise or any play means you need to do something.
Unless serenity has a different setup than mine, you can't repack these bearing just by shoving grease in the hub. There is a spacer inside the hub that keeps you from reaching the ball part of the bearings, even if the bearings don't have seals on the inside.
Take a look at the writing on the rim of the bearing. If you see 6302 ZZ, then it has shields on both sides. If it says 6302 2RS then it has seals on both sides.
Once you decide to remove the bearings, you can't repack them anyway as the process of removing the bearings destroys them!
Yes, you can replace them yourself, and you don't need to get the parts from the dealer either.
Go to a local bearing house and get 6302 bearings. You need to have either sealed or shielded on at least one side. P/N 6302 Z or ZZ, or RS or 2RS.
To get the old bearing out, have a punch or bolt or something that will reach all the way through the hub. You need to scooch that spacer off to the side enough to catch the inner race with the punch, then hammer the bearing out.
When that side comes out, so will the spacer, and getting the other side out is a lot easier.
Too put in the new bearings, you will need a socket that is the same size as the outer race of the bearing. I have one, but can't remember what size it is. When hammering in the bearing, you only want to be hitting the OUTER race (rim). If you hit the seal or the inner rim, you just destroyed the bearing. Put the socket on the bearing outer race, then hit the socket with the hammer.
Put the wheel on a firm but padded surface (carpet). Put a bearing in place and TAP it to get it started. Always use that socket, never hit the bearing with the hammer!! Make sure it is going in straight and started all the way around. Then you will need to smack it pretty hard to drive it all the way in until it seats. You will know when, as the sound changes when you hit it. Flip the wheel over, REMEMBER THE SPACER, and put the other bearing in the same way. When you are done, the axle should slide easily through both bearings.
Yes, I had a bearing go bad, but it was around 70,000 miles and I also ride in the dirt more than I should.
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