By making this hard anodized product made of aluminum, it has achieved a significant weight reduction compared to the GRK4/GRK5 standard steel product.
By changing the position of the hub pin mounting hole, it is a newly designed axle shaft that minimizes mounting play that can cause resistance during rotation.
Although it is compatible with general hexagonal hubs, by combining with GRK4/GRK5 aluminum brake rotor (R31W339), you can expect both speed of kicking due to the lightness of the axle body and rolling due to the inertia of the brake rotor.
