Quote:
Originally Posted by STEELCITYFIREBIRD
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If your not comfortable changing them, your better off using the ones already installed, considering the miles your likely to put on the vehicle.
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X2. If your more comfortable changing them and have the tools to remove and replace, then you should do it. Just to be factual, bearing cups, (races) and cones, (the roller part) are not a matched part. They are not lapped together, ground or machined in any way that makes them a {matched set}. That is an old wives tale. There could be a quality difference between the cup in the new rotor and a Timkin cup but who knows. Most of the Timkin bearings are made in China now anyway. A few are still made in the US. Country of origin should be on the box. Now you may have heard you should not mix bearing cups and cones from one side to the other and so forth. That is true, if they are USED. Once put into service, they do lap together and form a unique wear pattern. Either way, you should be fine. I have had several instances of cups turning or spinning in the hubs from being removed and replaced many times. I have never had a wheel bearing failure from a "mismatched" cup and cone in 40+ years of doing this type work.