You folks have seen the lower end of the 572 compared to the 372 crank bearings? If not will dig up the pic from a thread on my site.
372 575 576 385 390 all had crank bearing troubles IMO.
390 1mm bigger bore then 385. Neither have anything to do with 395.
2lbs difference in weight like RB said too. 390 to 395 weights.
I consider 390 and 660 in same class by weight same same and cc so close.
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