Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
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I'd suggest stopping by the LBS and just buying 20 new 3/16" ball bearings. They're inexpensive and you avoid the hassle of cleaning & inspecting the old ones.
Fresh grease, somewhat liberally applied.
IF the front has a QR hub, it takes a little practice to get the proper amount of "play". When you tighten the QR, it removes play from the bearings, so it'll take you a couple attempts to get the hang of it. Just stay calm
Park has a less expensive "double ended" (2 sizes on one wrench) for about $6. A worthy tool for the part timer.
RockHopper is a decent bike. I ride an 86!