Originally Posted by nashvillebill

Gotta disagree with that "prevailing wisdom"...

Bearing tolerances are very well controlled these days. Plus, the speeds are very low, and the loading is light, also we're not aiming for extremely tight tolerances on lateral or radial runout. We're not making gyroscopes or telescope mounts or semiconductor manufacturing equipment, we're rolling wheels and crankshafts.

Mix them and don't sweat it.