No, they're oval, but only very slightly oval, and oval oddly, meaning the bearing tracks are ground to have two or three irregularly spaced hollows to counter harmonics which were cracking the bearings at 20,000 RPM or what ever the high revs are. Too much for the bearings anyway, and something had to be done about it, and that's what they did. Perhaps they are not really a true ovality, but they are certainly not round either.