{"product_id":"ceramicspeed-ospw-aero-alpha-shimano-dura-ace-ultegra-di2-9250-8150","title":"CeramicSpeed OSPW Aero ALPHA — Shimano Dura-Ace\/Ultegra Di2 (9250\/8150)","description":"\u003cp\u003eThe most aerodynamically optimised pulley system CeramicSpeed makes — engineered specifically for Shimano Dura-Ace R9250 and Ultegra R8150 Di2. The OSPW Aero ALPHA pairs the new ALPHA Disc composite-tooth pulleys and ADR (Advanced Derailleur Roller) bearing protection with the proven aero-cage profile, giving TT and triathlon riders both watt savings and aero gains in a single upgrade.\u003c\/p\u003e\n\n\u003ch3\u003eWhy riders choose OSPW Aero ALPHA\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eStructural aerodynamic cage reduces rear-derailleur drag by up to 60%.\u003c\/strong\u003e The rear derailleur sits in dirty air right behind the leg, and standard cages give back free watts there. On a flat 40 km TT effort the aero cage hides real time you can feel in the legs at the line — exactly where TT and Ironman bike splits are won.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eOversized 13\/19 ALPHA Disc pulleys, 35–40% less drivetrain friction over stock.\u003c\/strong\u003e The composite-tooth ALPHA Disc profile rolls quieter and smoother than aluminium teeth, so you stack drivetrain efficiency on top of the aero gain — same effort, more speed, every full-power pull on the TT bars.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePatented ADR technology bearing protection.\u003c\/strong\u003e Standard pulley bearings die fast under race-day rain, sweat and pressure-washing. ADR seals out water and grit so the system stays silent and free-rolling through every race block instead of going crunchy mid-season.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHand-built in Denmark, Road \u0026amp; Tri certified.\u003c\/strong\u003e Pulleys, cages and bearings are produced and assembled by hand in Denmark to a 60,000 km service interval. You're getting race-grade hardware that survives a full TT\/Ironman season without a rebuild.\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 — bolts onto your existing R9250\/R8150 derailleur. Fit it the night before your A-race without any drivetrain anxiety.\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\u003eComplete OSPW Aero ALPHA system for Shimano 9250\/8150 (cage + 13\/19 ALPHA Disc pulleys, pre-assembled)\u003c\/li\u003e\n\u003cli\u003eMounting hardware\u003c\/li\u003e\n\u003cli\u003eCeramicSpeed decal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSKU: 113805\u003c\/li\u003e\n\u003cli\u003eNet weight: 111 g\u003c\/li\u003e\n\u003cli\u003ePulley material: Aluminium with composite ALPHA Disc tooth profile\u003c\/li\u003e\n\u003cli\u003eDiscipline: Road, TT and Tri\u003c\/li\u003e\n\u003cli\u003eDerailleur: Shimano Dura-Ace RD-R9250, Ultegra RD-R8150 (Di2 12-speed)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eIt is not possible to add ALPHA Disc pulleys to a previous-generation OSPW Aero cage — this is a complete updated system. Confirm 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":53441222869335,"sku":"CS-OSPW-AERO-SHI-9250","price":589.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0756\/5403\/7847\/files\/ospw-aero-shi-9250.png?v=1777530585","url":"https:\/\/shop.approvedcycling.com\/sl\/products\/ceramicspeed-ospw-aero-alpha-shimano-dura-ace-ultegra-di2-9250-8150","provider":"Approved Cycling","version":"1.0","type":"link"}