{"product_id":"ceramicspeed-ospw-rs-5-spoke-shimano-105-r7150-derailleur-pulley-black","title":"Ceramicspeed OSPW RS 5-Spoke for Shimano 105 R7150 Derailleur Pulley (Black)","description":"\u003cp style=\"text-align:center;font-style:italic;font-size:18px;border:1px solid #ddd;background:#f7f7f7;padding:16px;\"\u003eAn oversized pulley wheel upgrade for the Shimano 105 R7150 rider who wants a measurable drivetrain efficiency gain without moving up to a more expensive groupset.\u003c\/p\u003e\n\u003ch5\u003eOverview\u003c\/h5\u003e\n\u003cp\u003eCeramicSpeed's OSPW system replaces the stock Shimano derailleur cage and pulley wheels with a larger-diameter pulley set, which reduces how sharply the chain has to articulate as it runs through the derailleur. Less articulation means less friction, and over a full ride that adds up to a real, if modest, efficiency gain - the whole premise behind the OSPW line since CeramicSpeed introduced it in 2015.\u003c\/p\u003e\u003cp\u003eThis 5-Spoke version is built specifically for the Shimano 105 R7150 12-speed Di2 groupset, with a 13-tooth guide pulley and 19-tooth tension pulley mounted in a carbon cage, rated for cassettes up to 34 teeth. It's aimed at road, cyclocross, triathlon and time trial setups running 105 R7150 or the equivalent mechanical R7100 build.\u003c\/p\u003e\u003cp\u003eIt's a straightforward bolt-on upgrade for a 105-equipped bike rather than a full groupset change - the kind of component a rider adds once they're happy with everything else on the bike but still want to chase marginal gains.\u003c\/p\u003e\n\u003ch5\u003eWhy You'll Like It\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eLarger pulleys, less chain friction\u003c\/strong\u003e\u003cbr\u003eThe oversized 13T\/19T pulley wheels reduce chain articulation angle through the rear derailleur compared to the stock Shimano cage, which is the mechanism behind the claimed efficiency gain.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBuilt for your exact groupset\u003c\/strong\u003e\u003cbr\u003eThis version is specced precisely for 105 R7150, so there's no compatibility guesswork versus a generic one-size-fits-all pulley cage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCassette range covered\u003c\/strong\u003e\u003cbr\u003eRated up to a 34-tooth cassette, which covers the gearing most 105 R7150 riders are actually running, including wide-range builds for hillier routes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMulti-discipline ready\u003c\/strong\u003e\u003cbr\u003eSuited to road, cyclocross, triathlon and time trial use, so it's not a road-only upgrade if you split your riding across disciplines.\u003c\/p\u003e\n\u003ch5\u003eWho Is It For?\u003c\/h5\u003e\n\u003cp\u003eThis is for the 105 R7150 rider who's already dialed in their bike setup and is looking for a bolt-on efficiency upgrade rather than a full groupset change - someone training seriously, racing, or simply chasing a smoother-feeling drivetrain on long rides.\u003c\/p\u003e\u003cp\u003eIt's a particularly sensible pick for riders doing long weekend rides or multi-day touring in India, where a drivetrain that's already running efficiently pays off more over distance than it does on a short commute.\u003c\/p\u003e\u003cp\u003eIt also suits a rider who's budget-conscious about upgrades but still wants CeramicSpeed-level componentry - this sits below their higher-tier Dura-Ace-specific options while still delivering the same core OSPW concept.\u003c\/p\u003e\n\u003ch5\u003eGood to Know\u003c\/h5\u003e\n\u003cp\u003eHave your bike shop check derailleur limit screw settings after installation, since a larger pulley cage can shift the derailleur's resting position slightly compared to stock.\u003c\/p\u003e\u003cp\u003eKeep the pulley bearings clean and periodically check for play, especially if you ride in wet or dusty conditions regularly.\u003c\/p\u003e\u003cp\u003eDouble-check your cassette's largest sprocket size against the 34T maximum before ordering, particularly if you run a wide-range gravel-style cassette on your 105 build.\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 ceramic components, carbon cage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePulley Teeth\u003c\/strong\u003e: 13T (guide) \/ 19T (tension)\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 105 R7150 (12-speed Di2), mechanical R7100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed\u003c\/strong\u003e: 12 Speed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse\u003c\/strong\u003e: Road, cyclocross, triathlon, time trial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIn The Box\u003c\/strong\u003e: 1x CeramicSpeed OSPW RS 5-Spoke Pulley System\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":51230223761577,"sku":"113492","price":51750.0,"currency_code":"INR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/7793\/files\/787342402a79e6b3.jpg?v=1792072528","url":"https:\/\/bumsonthesaddle.com\/products\/ceramicspeed-ospw-rs-5-spoke-shimano-105-r7150-derailleur-pulley-black","provider":"BUMSONTHESADDLE","version":"1.0","type":"link"}