{"product_id":"shimano-ultegra-fc-r8100-kurbel-52-36-zahne-172-5-mm-2x12-fach-hollowtech-ii","title":"Shimano Ultegra FC-R8100 crankset 52\/36 teeth | 172.5 mm | 2x12-speed | Hollowtech II","description":"\u003cp\u003e\u003cstrong\u003eLightweight and stiff 2x12-speed road bike crankset with HOLLOWTECH II, HOLLOWGLIDE chainrings, and sporty 52\/36-tooth gearing for maximum power transfer and precise shifting.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eShimano Ultegra FC-R8100 crankset\u003c\/strong\u003e combines high stiffness, low weight, and efficient power transfer for demanding road cyclists. As a key component of the Ultegra R8100 12-speed group, it impresses with an optimized chainring design, precise gear shifts, and high-quality workmanship.\u003c\/p\u003e\n\u003cp\u003eThanks to proven \u003cstrong\u003eHOLLOWTECH II technology\u003c\/strong\u003e, the hollow-forged aluminum crank arms offer an excellent balance of stiffness, stability, and weight. The integrated 24 mm steel axle enables direct and efficient transfer of pedal power to the drivetrain.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eHOLLOWGLIDE technology\u003c\/strong\u003e of the large chainring ensures fast, precise shifts thanks to its lightweight, stiff hollow construction. The optimized tooth profile supports reliable chain shifts between the two chainrings, even under heavy loads.\u003c\/p\u003e\n\u003cp\u003eWith its \u003cstrong\u003e52\/36-tooth gearing\u003c\/strong\u003e, the Ultegra FC-R8100 offers sporty gearing for fast rides on flat roads, intensive training sessions, and challenging climbs. The \u003cstrong\u003e172.5 mm crank arms\u003c\/strong\u003e, a 44.5 mm chainline, and a 148 mm Q-factor round out its performance-oriented design.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003eHighlights:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHOLLOWTECH II:\u003c\/strong\u003e hollow-forged aluminum crank arms for high stiffness and efficient power transfer at low weight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHOLLOWGLIDE chainring:\u003c\/strong\u003e lightweight and stiff construction for fast, precise shifts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e52\/36-tooth gearing:\u003c\/strong\u003e sporty gearing for high speeds and versatile road bike use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2x12-speed compatibility:\u003c\/strong\u003e Optimized for modern Shimano Ultegra and Dura-Ace 12-speed drivetrains.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAsymmetric 4-arm crank spider:\u003c\/strong\u003e Balanced stiffness and low weight thanks to targeted material distribution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e172.5 mm crank length:\u003c\/strong\u003e Proven length for an efficient, sporty pedaling motion.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003eTechnical specifications:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Shimano\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct series:\u003c\/strong\u003e Ultegra R8100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e FC-R8100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct type:\u003c\/strong\u003e crankset\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntended use:\u003c\/strong\u003e Road bike\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrivetrain:\u003c\/strong\u003e 2-speed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGears:\u003c\/strong\u003e 12-speed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChainring sizes:\u003c\/strong\u003e 52\/36 teeth\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrank length:\u003c\/strong\u003e 172.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBolt circle diameter:\u003c\/strong\u003e 110 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrank spider:\u003c\/strong\u003e Asymmetric 4-arm mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChainline:\u003c\/strong\u003e 44.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ-factor:\u003c\/strong\u003e 148 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBottom bracket standard:\u003c\/strong\u003e Hollowtech II\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrankshaft diameter:\u003c\/strong\u003e 24 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended bottom bracket BSA:\u003c\/strong\u003e Shimano SM-BBR60\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended press-fit bottom bracket:\u003c\/strong\u003e Shimano SM-BB72-41B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible front derailleurs:\u003c\/strong\u003e Shimano FD-R8150, FD-R9250\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible chains:\u003c\/strong\u003e Shimano HG+ 12-speed, e.g. CN-M9100, CN-M8100, CN-M7100, CN-M6100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrank arm material:\u003c\/strong\u003e Aluminum, anodized\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrank spider material:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrankshaft material:\u003c\/strong\u003e Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge chainring material:\u003c\/strong\u003e Aluminum \/ carbon fiber reinforced plastic (CFRP)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall chainring material:\u003c\/strong\u003e Aluminum, anodized\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChainring bolt material:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTechnologies:\u003c\/strong\u003e HOLLOWTECH II, HOLLOWGLIDE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Matte\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Gray \/ Anthracite\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight according to manufacturer:\u003c\/strong\u003e approx. 711 g\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003eTechnologies:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHOLLOWTECH II:\u003c\/strong\u003e The hollow-forged aluminum crank arms and integrated 24 mm steel axle offer an optimal combination of high stiffness, low weight, and efficient power transfer. The construction minimizes energy losses and improves drivetrain efficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHOLLOWGLIDE:\u003c\/strong\u003e The large chainring features a lightweight, particularly stiff hollow construction made of aluminum and carbon fiber-reinforced plastic. This reduces deformation and supports fast, precise shifting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAsymmetrical 4-arm crank spider:\u003c\/strong\u003e The optimized arrangement of the crank arms ensures targeted distribution of the forces involved and provides high stiffness with minimal material use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003eIncluded:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e1x Shimano Ultegra FC-R8100 crankset with 172.5 mm crank length\u003c\/li\u003e\n\u003cli\u003e1x Shimano chainring combination, 52\/36 teeth (pre-installed)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e Supplied without bottom bracket and pedals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer part number:\u003c\/strong\u003e IFCR8100DX26 \u003cstrong\u003e| EAN:\u003c\/strong\u003e 4550170894054\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eThe Shimano Ultegra FC-R8100 crankset combines state-of-the-art 12-speed shifting technology with high stiffness and low weight. With its sporty 52\/36-tooth gearing and 172.5 mm crank arms, it is the ideal choice for performance-oriented road cyclists who value efficient power transfer and precise shifting.\u003c\/em\u003e\u003c\/p\u003e","brand":"Shimano","offers":[{"title":"Default Title","offer_id":57503033131273,"sku":"K3A1","price":139.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/3099\/6134\/files\/shimano-ultegra-fc-r8100-kurbel-5236-zaehne-1725-mm-2x12-fach-hollowtech-ii-1136062.webp?v=1793542508","url":"https:\/\/www.raaad.com\/en-en\/products\/shimano-ultegra-fc-r8100-kurbel-52-36-zahne-172-5-mm-2x12-fach-hollowtech-ii","provider":"RAAAD.com","version":"1.0","type":"link"}