{"product_id":"ceramicspeed-ospw-rs-alpha-shimano-105-di2-r7150","title":"CeramicSpeed OSPW RS ALPHA — Shimano 105 Di2 (R7150)","description":"\u003cp\u003eAn oversized pulley wheel system that finally gives 105 Di2 riders the same drivetrain efficiency the pro peloton runs. The CeramicSpeed OSPW RS ALPHA for Shimano 105 R7150 replaces the stock pulleys and cage with a hand-built, ceramic-bearing system that runs quieter, lasts longer, and frees up real watts on every climb and TT effort.\u003c\/p\u003e\n\n\u003ch3\u003eWhy riders choose OSPW RS ALPHA for 105 Di2\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eOversized 13T + 19T aluminium pulleys with ceramic bearings.\u003c\/strong\u003e The stock 11T pulleys on R7150 force the chain through tight bends that bleed watts and wear the chain quickly. Larger pulleys reduce chain articulation and friction so you save measurable wattage at threshold and your chain lasts visibly longer between replacements.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eUp to 60% less drivetrain friction vs stock 105.\u003c\/strong\u003e Most riders never realise how much friction is hidden in the rear derailleur — it costs 2–3 watts at race power. The OSPW system gives those watts back so your 105 Di2 bike pulls level with bikes running far more expensive groupsets.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCarbon-fibre cage with sealed pivot.\u003c\/strong\u003e Stock plastic cages flex under hard sprints and big gear changes. The reinforced ALPHA cage stays rigid through full-power efforts so shifting stays crisp through every interval and group ride attack.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCustom seal, 60% better moisture protection.\u003c\/strong\u003e Wet rides and bike washes kill standard derailleur pulleys within a season. The redesigned seal blocks water and grit so the bearings keep spinning quiet through winter base miles and post-ride hose-downs.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlug-and-play install in under 15 minutes.\u003c\/strong\u003e No chain length change, no derailleur recalibration — it bolts straight onto your existing R7150 derailleur with the supplied tools.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e2-year warranty, 60,000 km service interval.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWhat's in the box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOSPW RS ALPHA cage with 13T + 19T ceramic-bearing pulleys\u003c\/li\u003e\n\u003cli\u003eUFO TECH All Round Bearing Grease (5 ml)\u003c\/li\u003e\n\u003cli\u003eMounting hardware + install tools\u003c\/li\u003e\n\u003cli\u003eCeramicSpeed decal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDerailleur: Shimano 105 RD-R7150 (Di2 12-speed)\u003c\/li\u003e\n\u003cli\u003eDrivetrain: 12-speed road\u003c\/li\u003e\n\u003cli\u003eDiscipline: Road, Tri\u003c\/li\u003e\n\u003cli\u003eSystem weight: 96 g\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eConfirm your derailleur model code (printed on the inside cage) before ordering. If you're unsure, contact us and we'll confirm fitment for your bike.\u003c\/p\u003e","brand":"CeramicSpeed","offers":[{"title":"Default Title","offer_id":53441220215127,"sku":"CS-OSPW-RS-SHI-7150","price":499.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0756\/5403\/7847\/files\/ospw-rs-shi-7150.png?v=1777530543","url":"https:\/\/shop.approvedcycling.com\/es\/products\/ceramicspeed-ospw-rs-alpha-shimano-105-di2-r7150","provider":"Approved Cycling","version":"1.0","type":"link"}