{"product_id":"ceramicspeed-oversized-ceramic-pulley-wheel-system-limited-giro-ditalia-shimano-dura-ace-9100","title":"CeramicSpeed Oversized Ceramic Pulley Wheel System - Limited Giro d'Italia - Shimano Dura-Ace 9100","description":"\u003cp\u003eWith the advent Shimano Dura-Ace 9100 mechanical and 9150 electronic,  the most common rear derailleurs used by pros, it was essential that  CeramicSpeed develop a new Oversized Ceramic Pulley Wheel System (OSPWS) for  the derailleur.\u003c\/p\u003e\n\u003cp\u003eAs you can imagine, CeramicSpeed has done everything possible to  reduce frictional drag to as close to zero as is possible. They started with  pulley size. They determined that the best solution was a 13-tooth upper pulley  and a 19-tooth lower. This way, you can install cassettes up to 32-teeth on  your rear wheel and still take advantage of these pulleys. \u003c\/p\u003e\n\u003cp\u003eThe result is a 30% drop in mechanical friction and three to five  times longer lifetime than the standard Shimano pulley setup. The pulleys are  fabricated out of aluminum and have spokes supporting the teeth rather than  solid aluminum, which both reduces weight and reduces muck buildup in dirty  conditions. \u003c\/p\u003e\n\u003cp\u003eBut this isn’t merely about reducing friction. It’s about improving  performance everywhere possible. The cage is a carbon-reinforced plastic to  both provide the rigidity shifting requires and the lowest possible weight for  the design. The spring tension is adjustable, so you can get the wrap you want.  The bolts CeramicSpeed includes with the pulleys are titanium. \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\u003eThere  are two options with this kit, uncoated, and coated. Uncoated is what they base  most of their test data off of, so it’s the CeramicSpeed standard. Coated is even  smoother and longer lasting, as it’s a metallic layer on top of the races,  three microns thick and 75% harder than hardened steel races. \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 you fear. You’ll need 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.  They kit also comes with their  own Pulley Wheel Oil.\u003c\/p\u003e\n\u003cp\u003eThe CeramicSpeed  OSPWS for Shimano 9100\/9150 rear derailleurs takes Shimano’s top-of-the-line  changer that much higher. \u003c\/p\u003e","brand":"CeramicSpeed","offers":[{"title":"Pink","offer_id":43509651898412,"sku":"105026","price":374.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/7684\/9196\/files\/ceramicspeed-oversized-ceramic-pulley-wheel-system-limited-giro-ditalia-shimano-dura-ace-9100-2838247.jpg?v=1771301709","url":"https:\/\/ricycles.com\/products\/ceramicspeed-oversized-ceramic-pulley-wheel-system-limited-giro-ditalia-shimano-dura-ace-9100","provider":"RA Cycles","version":"1.0","type":"link"}