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).
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