{"product_id":"ceramicspeed-oversized-ceramic-pulley-wheel-system-shimano-11-speed","title":"CeramicSpeed Oversized Ceramic Pulley Wheel System - Shimano 11 Speed","description":"\u003cp\u003eCeramicSpeed’s dedication to reducing bearing friction  has taken a big new step in the friction-free direction. It is their Oversized  Ceramic Pulley Wheel System for Shimano derailleurs. It 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  determined 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 these pulleys bring you is a savings of 2.37  watts over two 11t Dura-Ace Pulley wheels. Or, if you prefer to think of  frictional losses, the 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\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 Ceramic Pulley  Wheel System for Shimano derailleurs makes you even faster.\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":43509656289324,"sku":"101635","price":449.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/7684\/9196\/files\/ceramicspeed-oversized-ceramic-pulley-wheel-system-shimano-11-speed-2736170.jpg?v=1771301707","url":"https:\/\/ricycles.com\/products\/ceramicspeed-oversized-ceramic-pulley-wheel-system-shimano-11-speed","provider":"RA Cycles","version":"1.0","type":"link"}