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If you are talking about adding bearings in the journals of your trucks and keeping the metal wheels you can do that. Ball bearing wheels usually have the bearings built into the wheel so you need to replace the entire wheel set. What you need to do first is measure the outside dimension of the axle before you do anything else. I just returned 200 bearings I ordered because they didn't fit the axles.
 

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I ordered the 99MF63-ZZ-X10 from bocabearing at 10 for $9.90. THEY DO NOT FIR THE ARISTO AND USA AXLES. I had to return them. The inside dimension of the bearing is 3.05 mm. The outside axle dimension on the Aristo axle is 3.15 mm. I talked to a bearing specialist at PYC International and ordered mine from http://www.bearings-china.com/ Minimum order was 1000. When they come in I will list what I don't need on ebay.
 
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