This whole bearing debate is quite funny really. Everyone gets hung up on high "ABEC" numbers. Higher number generally means tighter tolerances, which can actually be a bad thing.
Let's look at a typical plastic hub carrier found on most model cars. Put a pair of ABEC 7/9 bearings in it, what do you think will happen if the 2 bearing pockets don't perfectly line up..........and what do you think are the chances of them being perfectly in alignment?? Same with a 2wd gearbox casing, of the diff outputs don't perfectly line up, and you put super precision bearings on the diff, what will happen - not a lot!!
Think about it! ABEC rating also says nothing about the quality of the materials used make the bearings!!
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Matthew White
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