WHAT IS BETTER ABOUT A GREASED WHEEL-END WHEN COMPARED TO A TRADITIONAL OIL OR SEMI-FLUID LUBRICATED WHEEL-END?
Grease is easier to keep in the wheel-end than oil or semi-fluids. This means grease is less likely to get on the brakes. Since grease is easier to seal, the WHEEL BOSS grease seal is self-venting and designed with lower operating torque. Therefore, the self-venting grease seal permits the use of the non-vented hub cap.