DT Swiss Set of 4 SINC Ceramic Bearings for RC rim Brake Wheels and 240 non-Disc Hubs are designed to enhance your cycling experience with precision and durability. These ceramic bearings are a perfect upgrade for your rim brake RC carbon road wheels. Key Features Upgrade kit specifically for rim brake RC carbon road wheels Custom-made by DT Swiss, the SINC system ensures top-notch bearing quality Not all ceramic bearings are equal; quality depends on material grade and construction tolerances SINC bearings feature balls made in Japan from Si3N4 Silicon nitride, known for its toughness and smoothness DT's custom carriers and seals provide low rolling resistance and long-lasting performance Includes main bearings for both front and rear hubs, totalling 4 bearings Packaged in a presentation tin with a USB stick for detailed installation instructions For best results, have SINC bearings installed by trained mechanics using the DT Swiss hub servicing tool kit DT Swiss Set of 4 SINC Ceramic Bearings for RC rim Brake Wheels and 240 non-Disc Hubs are crafted to deliver exceptional performance. The use of Si3N4 Silicon nitride ensures the balls are as round as possible, thanks to advanced production techniques. This results in a bearing that offers minimal rolling resistance and outstanding durability. For optimal performance, it's recommended to have these bearings installed by professionals using the appropriate tools.