{"product_id":"shimano-ultegra-fc-r8100-12-speed-front-crankset-size-50-34t-170mm","title":"Shimano Ultegra FC-R8100 12 Speed Front Crankset [Size: 50-34T (170mm)]","description":"\u003cp\u003eAs the central element of the 12-speed drivetrain of the Ultegra R8100 series, the FC-R8100 crankset is characterised by the shifting quality and transmission efficiency typical of Shimano. Not only the chainrings which feature a Hollowglide construction, but also the lightweight crank arms which are manufactured using Hollowtech II technology, contribute to optimised power transmission as well as faster and more precise shifting operations.\u003c\/p\u003e \n \n\u003cp\u003eAll this adds up to a perfect balance between stiffness, stability, light weight and rotational efficiency. Numerous crank arm lengths and chainrings with 50-34 or 52-36 teeth also offer variability and an optimal gear ratio for almost every riding situation.\u003c\/p\u003e \n \n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eTechnologies\u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e \n \n\u003cp\u003eThe guiding principle of Shimano's Hollowtech II technology is the perfect balance between stiffness, stability, weight and rotational efficiency. The goal was to produce a crank that minimises the effort required for the drive and enables more efficient power transmission.\u003c\/p\u003e \n \n\u003cp\u003eAn exclusive forging process allows the production of extremely light crank arms that nevertheless guarantee maximum stiffness. The fixed connection of the right arm to the axle of the bottom bracket and its external bearing also serve an optimum relationship between stiffness and low weight.\u003c\/p\u003e \n \n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e \n \n\u003ctable border=\"1\" cellpadding=\"3\" cellspacing=\"1\"\u003e \n \u003ctbody\u003e \n  \u003ctr\u003e \n   \u003cth scope=\"row\"\u003eMaterial\u003c\/th\u003e \n   \u003ctd\u003eCrank arms, inner chainring: aluminium (anodised)\u003cbr\u003e \n   Outer chainring: aluminium (anodized), carbon fiber reinforced polymer (CFRP)\u003cbr\u003e \n   Axle: steel (plated)\u003c\/td\u003e \n  \u003c\/tr\u003e \n  \u003ctr\u003e \n   \u003cth scope=\"row\"\u003eCompatibility\u003c\/th\u003e \n   \u003ctd\u003eFront derailleur: FD-R9250, FD-R8150\u003cbr\u003e \n   Bottom bracket: SM-BBR60 (thread type), SM-BB72-41B (Press Fit)\u003cbr\u003e \n   Chain: CN-M9100, CN-M8100, CN-M7100, CN-M6100\u003c\/td\u003e \n  \u003c\/tr\u003e \n  \u003ctr\u003e \n   \u003cth scope=\"row\"\u003eCrank Arm Length\u003c\/th\u003e \n   \u003ctd\u003e160, 165, 170, 172,5, 175\u003c\/td\u003e \n  \u003c\/tr\u003e \n  \u003ctr\u003e \n   \u003cth scope=\"row\"\u003eShifting System\u003c\/th\u003e \n   \u003ctd\u003e12-speed\u003c\/td\u003e \n  \u003c\/tr\u003e \n  \u003ctr\u003e \n   \u003cth scope=\"row\"\u003eBottom Bracket Axle Profile\u003c\/th\u003e \n   \u003ctd\u003e24mm Hollow Shaft\u003c\/td\u003e \n  \u003c\/tr\u003e \n  \u003ctr\u003e \n   \u003cth scope=\"row\"\u003eBottom Bracket Case Width\u003c\/th\u003e \n   \u003ctd\u003e68mm, 70mm\u003c\/td\u003e \n  \u003c\/tr\u003e \n  \u003ctr\u003e \n   \u003cth scope=\"row\"\u003eRoad - Bolt Circle Diameter\u003c\/th\u003e \n   \u003ctd\u003e110mm\u003c\/td\u003e \n  \u003c\/tr\u003e \n  \u003ctr\u003e \n   \u003cth scope=\"row\"\u003eChainring Mount\u003c\/th\u003e \n   \u003ctd\u003e2-speed\u003c\/td\u003e \n  \u003c\/tr\u003e \n  \u003ctr\u003e \n   \u003cth scope=\"row\"\u003eChain Line\u003c\/th\u003e \n   \u003ctd\u003e44.5mm\u003c\/td\u003e \n  \u003c\/tr\u003e \n  \u003ctr\u003e \n   \u003cth scope=\"row\"\u003eQ-Factor\u003c\/th\u003e \n   \u003ctd\u003e148mm\u003c\/td\u003e \n  \u003c\/tr\u003e \n  \u003ctr\u003e \n   \u003cth scope=\"row\"\u003eColour\u003c\/th\u003e \n   \u003ctd\u003eBlack\u003c\/td\u003e \n  \u003c\/tr\u003e \n  \u003ctr\u003e \n   \u003cth scope=\"row\"\u003eWeight\u003c\/th\u003e \n   \u003ctd\u003eApprox. 700 grams (50-34 teeth)\u003cbr\u003e \n   Approx. 711 grams (52-36 teeth)\u003c\/td\u003e \n  \u003c\/tr\u003e \n \u003c\/tbody\u003e \n\u003c\/table\u003e","brand":"Shimano","offers":[{"title":"50-34T (170mm) \/ 12 Speed","offer_id":44168178860074,"sku":"IFCR8100CX04_GROUPSET","price":379.0,"currency_code":"AUD","in_stock":false}],"url":"https:\/\/cyclesy.cc\/products\/shimano-ultegra-fc-r8100-12-speed-front-crankset-size-50-34t-170mm","provider":"Cyclesy","version":"1.0","type":"link"}