The front wheels bearings went out on my YZ250FX this winter in about 6 rides. The bearings were good last fall when I swapped on the studded tires. I greased them too. The YX450FX uses the exact same front wheel and spacer as the YZ250FX. I got way more time on the front wheel bearings on my WR450F. In fact they never failed at all, in the same riding conditions. The spacers on it had mud shields built in like the rear wheels on the YZFX do. Anyone know of WR style spacers that would fit the YZFXs ? All the WR axles, including the 2016 WR450F use 20mm axles and different hubs than the YZFXs. YZs use the new 22mm front axle.