Which bike rotor to choose? Six-bolt or Centerlock? It is often a matter of preference. However, some hubs are designed differently depending on the type of rotor.
For example, there are front Koozer 450 hubs in MTB versions (based on a 15 mm wheel axle).
Hubs for six-bolt rotors use bigger 18307 (18x30x7 mm) bearings. And there is an internal hub axle (15x18 mm) that goes through the bearings.
(J-bend spokes)
(Straight-pull spokes)
Hubs for Centerlock rotors use smaller 6902 (15x28x7 mm) bearings. These hubs have no internal axle going through the bearings, just a spacer sits between them.
(J-bend spokes)
(Straight-pull spokes)
This applies to the front MTB hubs only. Regardless of rotor type, the front/rear road versions and the rear MTB versions of the Koozer 450 use 6902 bearings and an internal hub axle (12x15 mm).
I'd prefer 6 screws. It's simpler, and I've always used screws on my motorcycles. And of course, straight spokes. As for the bearings, the larger ones will roll a little worse. Well, let's compare them based on load-bearing capacity. They're the same width, and the diameters are roughly the same. The ball size is most likely the same. The maximum difference is the number of balls. But it's best to check the reference books (and also the availability of a particular size).
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