{"product_id":"ceramicspeed-ospw-rs-alpha-shimano-r9250-r8150-derailleur-pulley-black","title":"Ceramicspeed OSPW RS Alpha for Shimano Dura-Ace R9250\/Ultegra R8150 Derailleur Pulley (Black)","description":"\u003cp style=\"text-align:center;font-style:italic;font-size:18px;border:1px solid #ddd;background:#f7f7f7;padding:16px;\"\u003eCeramicSpeed's top-tier oversized pulley system for the Dura-Ace R9250\/Ultegra R8150 rider who wants the brand's best drivetrain efficiency upgrade, team-logo finish included.\u003c\/p\u003e\n\u003ch5\u003eOverview\u003c\/h5\u003e\n\u003cp\u003eThe Alpha RS sits above the standard OSPW RS line as CeramicSpeed's higher-spec oversized pulley wheel system, built for Shimano's Dura-Ace R9250 and Ultegra R8150 12-speed Di2 groupsets. It carries CeramicSpeed's signature team-logo cage finish, the same cosmetic treatment used on their WorldTour-level componentry.\u003c\/p\u003e\u003cp\u003eInside, it runs 15-tooth guide and 19-tooth tension pulleys on hybrid ceramic bearings in a carbon cage, rated for cassettes up to 34 teeth across the full 12-speed Di2 range. The box includes a Dura-Ace R9250-specific derailleur spacer and CeramicSpeed's own pulley bearing oil for ongoing maintenance - details that place this at the premium end of the OSPW lineup rather than the entry point.\u003c\/p\u003e\u003cp\u003eThis is the pick for a rider who wants CeramicSpeed's flagship pulley system rather than its standard offering - someone for whom the Alpha's bearing quality and finish justify the step up from the 5-Spoke version.\u003c\/p\u003e\n\u003ch5\u003eWhy You'll Like It\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eCeramicSpeed's flagship pulley tier\u003c\/strong\u003e\u003cbr\u003eThe Alpha sits above the standard OSPW RS range, with the brand's best hybrid ceramic bearings and a team-logo carbon cage finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMatched to Dura-Ace\/Ultegra 12-speed Di2\u003c\/strong\u003e\u003cbr\u003eSized specifically for R9250 and R8150, including a dedicated Dura-Ace R9250 derailleur spacer included in the box.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eComes with bearing oil\u003c\/strong\u003e\u003cbr\u003eCeramicSpeed includes their own pulley bearing oil in the box, so you're set up for ongoing maintenance from day one rather than sourcing it separately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWide gearing range covered\u003c\/strong\u003e\u003cbr\u003eRated up to a 34T cassette, so it suits both tighter road gearing and wider-range climbing setups on the same groupset.\u003c\/p\u003e\n\u003ch5\u003eWho Is It For?\u003c\/h5\u003e\n\u003cp\u003eThis is for the serious racer or dedicated enthusiast already on Dura-Ace R9250 or Ultegra R8150 who wants CeramicSpeed's best pulley system rather than its mid-tier option - someone for whom marginal drivetrain gains and premium componentry both matter.\u003c\/p\u003e\u003cp\u003eIt makes the most sense for riders doing structured training, racing, or long weekend rides in India where drivetrain efficiency compounds over distance, rather than short commuter use where the gain is barely noticeable.\u003c\/p\u003e\n\u003ch5\u003eGood to Know\u003c\/h5\u003e\n\u003cp\u003eUse the included bearing oil on a regular maintenance schedule to keep the ceramic bearings running at their best - don't substitute a generic chain lube for pulley bearing servicing.\u003c\/p\u003e\u003cp\u003eFit the included Dura-Ace R9250 derailleur spacer as directed; skipping it can affect derailleur alignment on this specific groupset.\u003c\/p\u003e\u003cp\u003eHave a mechanic check B-tension and limit screws after installation, as with any oversized pulley cage swap.\u003c\/p\u003e\n\u003ch5\u003eTechnical Specifications\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Stainless steel and hybrid ceramic bearings, carbon cage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearings\u003c\/strong\u003e: Hybrid ceramic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePulley Teeth\u003c\/strong\u003e: 15T (guide) \/ 19T (tension)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 102g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCassette Teeth Max\u003c\/strong\u003e: 34T\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility\u003c\/strong\u003e: Shimano Dura-Ace R9250 and Ultegra R8150 (12-speed Di2)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed\u003c\/strong\u003e: 12 Speed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIn The Box\u003c\/strong\u003e: CeramicSpeed Alpha RS OSPW, Dura-Ace R9250 derailleur spacer, pulley bearing oil\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eAdditional Information\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e: China\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImported By\u003c\/strong\u003e: Ensign Sports, 502, Hill Glade, Opp. HDFC Bank Pali Road, Bandra, Mumbai - 400050, Maharashtra, India.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNet Quantity\u003c\/strong\u003e: 1N\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomer Care Address\u003c\/strong\u003e: 291, 10 Main, 5 Block, Jayanagar, Bangalore - 560041. Ph: (080)47183232, Email: support@bumsonthesaddle.com\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommodity\u003c\/strong\u003e: Derailleur Pulley\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ensign Sports IGL","offers":[{"title":"Default Title","offer_id":51230279237801,"sku":"113491","price":54000.0,"currency_code":"INR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/7793\/files\/96bbe8248032ef58.jpg?v=1792072537","url":"https:\/\/bumsonthesaddle.com\/products\/ceramicspeed-ospw-rs-alpha-shimano-r9250-r8150-derailleur-pulley-black","provider":"BUMSONTHESADDLE","version":"1.0","type":"link"}