Well the stock bearings are not great really, but can easily be fixed by swapping to better bearings like SKF, stainless or stainless/ceramic. Another thing that people tend to do is to tighten too much the bolt on the freehub side. It compresses more the bearings so it doesn't turn as smoothly. What I do is tighten just enough and apply a small line of Loctite on the axle threads perpendicularly just to be safe. Once you tighten the quick release it should not loosen anyways.
Cup-cone bearings are better and lighter, but the seals also drag a lot on the axle when new. One thing to do is put small cuts on the seals facing the axle so that it doesn't drag. makes it much smoother. If the roads you race in are mostly flat and are on the heavier side, then the Scirocco will do just fine. They should be stiffer and maybe more aero. If you have lots of hills I would go more with the Zonda as they are 200gr+ less.
Thanks for input. Out of curiosity, where could I find SKF bearings for it? Is there a specific part # that I should search for or it's pretty much universal for sealed hubs? I assume the hub is tightened at the factory and one should only tighten it harder when the play develop over time, right?
Is the freehub hardened (white) on Zonda's as well?
Road races are typically rolling hills with some punchy hills and crits are flat. Looks like Zonda's are ~270 grams lighter, which is an advantage for constant attacks.
Racing is a three-dimensional high-speed chess game, involving hundreds of pieces on the board.
CBA = Chronic Bike Addiction
OCD = Obsessive Cycling Disorder