The Non-Drive side of the Optimized freecoaster was designed completely around grinding. Included is a completely integrated non-drive side plastic hub guard that easily slides over the existing cone to simplify your installation experience. Shadow designed a smaller hub flange to stay out of the way which allowed us to create a smaller hub guard that doesn't need to be gigantic to get the job done. On the inside, they moved to a more reliable bushing resistance system that dissolves all previous engagement issues. Creating a more enjoyable freecoaster experience for you.