{"product_id":"ceramicspeed-oversized-ceramic-coated-pulley-wheel-system-shimano-11-speed","title":"CeramicSpeed Oversized Ceramic Coated Pulley Wheel System - Shimano 11 Speed","description":"\u003cp\u003eThe award for the fastest set of derailleur pulleys  goes to CeramicSpeed’s Oversized Coated Ceramic Pulley Wheel System for Shimano  derailleurs, nosing out CS’s standard version of the same. As with the standard  version, this one will work with all 11- and 10-Speed Shimano Dura-Ace and  Ultegra derailleurs, both mechanical and Di2. \u003c\/p\u003e\n\u003cp\u003eRather than accept the industry dictating the size of derailleur  pulleys, they decided to determine which size would be ideal. They found that  seventeen-tooth pulleys would not only dramatically reduce friction, but keep  shifting performance crisp. Because such pulleys are too big to fit in  conventional pulley cages, they also had to design the cage system, which is  made of carbon-reinforced polyamide. Even with the oversized aluminum pulleys,  larger bearings, and oversized cage, the total weight is only 55g, which is  only 10g more than what the standard Shimano bearings and cages weigh. And even  with the increases size of pulleys and the custom cage (carbon-fiber, of  course), the rear derailleur, which is designed to accommodate 11-28 cassettes\u003c\/p\u003e\n\u003cp\u003eIn terms of aerodynamics, there is no aero penalty. In  some cases, at some yaw angles and rim depths, there is actually an aero gain. \u003c\/p\u003e\n\u003cp\u003eThe benefit the standard oversized CS pulleys is a  savings of 2.37 watts over two 11t Dura-Ace Pulley wheels. These coated pulleys  will save you more. Or, if you prefer to think of frictional losses, the regular  CeramicSpeed System costs only 1.43 watts in terms of drag, whereas the  Dura-Ace system costs 3.8 watts. The larger pulleys spin at 65% of the speed of  smaller pulleys, which further helps increase durability of the system-CS bearings  already last three to five times longer than standard Dura-Ace pulleys. And  when the day comes that you realize you’ve worn out these pulleys, CS has  replacements at the ready.\u003c\/p\u003e\n\u003cp\u003eThe heart of the system are CeramicSpeed’s standard  hybrid ceramic bearing. CeramicSpeed utilizes Grade 3 Silicon  Nitride balls that possess the best possible surface finish and roundness. In  testing, the balls are 400% smoother, 128% harder, and 58% lighter than  standard steel balls found in most bike components. They’re more than 100%  smoother and 15% harder than standard ceramic balls. The balls are installed  into hardened steel races in dust-free clean rooms and then checked again  before assembly is complete. \u003c\/p\u003e\n\u003cp\u003ePart of CeramicSpeed’s commitment to having the lowest-friction  bearings on the market is keeping up their research and development. That led  them to a special metallic coating that can be applied three microns thick on  the races. It makes the treated of the steel races surface 80% harder than  hardened steel. In terms of friction, the already low-friction CeramicSpeed  bearings with the treatment see friction reduced by over 50%. In terms of  service life, these coated bearings last even longer, like over 60% longer,  than the standard CeramicSpeed bearings. Better yet, the coating means the  races better resist contamination from water, dirt, degreaser, etc. Aka, the  risk of bearing failure due to corrosion has been reduced to near zero. They  can even run without grease or oil, though CeramicSpeed recommends their oil for  longer life and lower friction.\u003c\/p\u003e\n\u003cp\u003eAs you can imagine, installing this  system is a bit more involved than replacing pulleys. Rest-assured, it is more  straightforward than it looks. You’ll need a Philips head screwdriver and a set  of Allen keys. You can perform the installation on the bike or off, though on  makes the installation a bit easier. You’ll probably also need a few more links  in your chain, so starting with a new chain might be the easiest way to begin.\u003c\/p\u003e\n\u003cp\u003eCeramicSpeed’s Oversized Coated Ceramic  Pulley Wheel System for Shimano derailleurs means your derailleur offers nearly  no drag at all. \u003c\/p\u003e\u003cp\u003e\u003cb\u003eNote:\u003c\/b\u003e  This item is not compatible with Shimano Dura-Ace 9100 or 9170\u003c\/p\u003e","brand":"CeramicSpeed","offers":[{"title":"Black","offer_id":43509656420396,"sku":"101638","price":524.25,"currency_code":"USD","in_stock":true},{"title":"Red","offer_id":43509656453164,"sku":"101643","price":524.25,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/7684\/9196\/files\/ceramicspeed-oversized-ceramic-coated-pulley-wheel-system-shimano-11-speed-2368696.jpg?v=1771301708","url":"https:\/\/ricycles.com\/products\/ceramicspeed-oversized-ceramic-coated-pulley-wheel-system-shimano-11-speed","provider":"RA Cycles","version":"1.0","type":"link"}