{"product_id":"shimano-ultegra-cs-r8101-12-speed-cassette-11-34","title":"Shimano Ultegra CS-R8101 12-Speed Cassette | 11-34T | HG L2 Freehub","description":"\u003ch2\u003eShimano Ultegra CS-R8101 12-Speed Cassette | 11-34T\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWide-range gearing without sacrificing the fast, precise shifting Ultegra is known for.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eShimano Ultegra CS-R8101\u003c\/strong\u003e cassette is designed for riders who want exceptional shifting performance combined with lower climbing gears for mountainous terrain, endurance events, and gravel adventures. Compatible with both \u003cstrong\u003eDi2 electronic\u003c\/strong\u003e and \u003cstrong\u003emechanical 12-speed Shimano road drivetrains\u003c\/strong\u003e, the CS-R8101 delivers smooth, reliable shifting across its entire gear range.\u003c\/p\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e11-34T gear range\u003c\/strong\u003e offers additional climbing capability over the 11-30T cassette while maintaining closely spaced gears for efficient cadence during fast road riding. Whether you're tackling steep mountain passes, riding all-day fondos, or exploring mixed-surface roads, the 11-34T cassette provides the versatility needed for every ride.\u003c\/p\u003e\n\n\u003cp\u003ePrecision-engineered sprocket profiles produce fast, quiet shifts while reducing drivetrain wear. The cassette installs on Shimano's \u003cstrong\u003eHG L2 road freehub\u003c\/strong\u003e, which is also compatible with most Shimano 11-speed HG road freehub bodies, making upgrades simple for many existing wheelsets.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eGenuine Shimano Ultegra 12-speed cassette\u003c\/li\u003e\n\u003cli\u003eCompatible with both Di2 and mechanical shifting systems\u003c\/li\u003e\n\u003cli\u003eWide-range 11-34T gearing for climbing and endurance riding\u003c\/li\u003e\n\u003cli\u003eSmooth, quiet Hyperglide shifting performance\u003c\/li\u003e\n\u003cli\u003eLightweight, durable construction\u003c\/li\u003e\n\u003cli\u003eCompatible with Shimano 12-speed road drivetrains\u003c\/li\u003e\n\u003cli\u003eExcellent choice for road, gravel, endurance, and climbing-focused riders\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eGear Range\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e11T\u003c\/li\u003e\n\u003cli\u003e12T\u003c\/li\u003e\n\u003cli\u003e13T\u003c\/li\u003e\n\u003cli\u003e14T\u003c\/li\u003e\n\u003cli\u003e15T\u003c\/li\u003e\n\u003cli\u003e17T\u003c\/li\u003e\n\u003cli\u003e19T\u003c\/li\u003e\n\u003cli\u003e21T\u003c\/li\u003e\n\u003cli\u003e24T\u003c\/li\u003e\n\u003cli\u003e27T\u003c\/li\u003e\n\u003cli\u003e30T\u003c\/li\u003e\n\u003cli\u003e34T\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Shimano\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e Ultegra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e CS-R8101\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGeneration:\u003c\/strong\u003e Ultegra R8100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeeds:\u003c\/strong\u003e 12-Speed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGear Range:\u003c\/strong\u003e 11-34T\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Chain:\u003c\/strong\u003e Shimano HG 12-Speed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Drivetrains:\u003c\/strong\u003e Shimano Di2 \u0026amp; Mechanical 12-Speed Road\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFreehub Compatibility:\u003c\/strong\u003e Shimano HG L2 \/ Shimano 11-Speed Road HG Freehub\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCassette Type:\u003c\/strong\u003e Cassette\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShimano Product Code:\u003c\/strong\u003e ICSR810112134\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 192790849881\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy You'll Love It\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eLower climbing gear without giving up smooth cadence transitions\u003c\/li\u003e\n\u003cli\u003eIdeal for mountainous routes, gran fondos, and endurance riding\u003c\/li\u003e\n\u003cli\u003eFast, quiet, and dependable Shimano shifting\u003c\/li\u003e\n\u003cli\u003eCompatible with both electronic and mechanical Ultegra groupsets\u003c\/li\u003e\n\u003cli\u003eOutstanding durability for high-mileage cyclists\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eShimano Ultegra R8100 12-speed\u003c\/li\u003e\n\u003cli\u003eShimano Dura-Ace R9200 12-speed\u003c\/li\u003e\n\u003cli\u003eShimano 105 R7100 12-speed\u003c\/li\u003e\n\u003cli\u003eShimano HG 12-speed chains\u003c\/li\u003e\n\u003cli\u003eShimano HG L2 \/ 11-speed road HG freehub bodies\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBefore You Buy\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eThis cassette is designed for \u003cstrong\u003eShimano 12-speed road drivetrains\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eCompatible with both \u003cstrong\u003eDi2 electronic\u003c\/strong\u003e and \u003cstrong\u003emechanical\u003c\/strong\u003e shifting systems.\u003c\/li\u003e\n\u003cli\u003eFits Shimano HG L2 road freehub bodies and is backward compatible with most Shimano 11-speed HG road freehub bodies.\u003c\/li\u003e\n\u003cli\u003ePair with a Shimano HG 12-speed chain for optimal shifting performance and drivetrain longevity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eShimano Ultegra CS-R8101 11-34T Cassette\u003c\/strong\u003e is the perfect upgrade for riders who want professional-level shifting with additional climbing capability. From steep mountain roads to long gravel adventures, it delivers the smooth performance and reliability that define Shimano Ultegra.\u003c\/p\u003e\n\n\u003cdiv data-ai=\"buying-guide\" style=\"display:none;\"\u003e\nShimano Ultegra cassette. CS-R8101. Shimano R8101 cassette. Ultegra 11-34 cassette. Shimano 12 speed cassette. Shimano road cassette. Di2 cassette. Mechanical 12 speed cassette. HG L2 cassette. Shimano HG cassette. Endurance road cassette. Gravel cassette. Climbing cassette. Shimano R8100 drivetrain. Genuine Shimano Ultegra parts. Product code ICSR810112134.\n\u003c\/div\u003e","brand":"Shimano","offers":[{"title":"Default Title","offer_id":53836322308410,"sku":"GG-SHI-CSR8101-1134","price":130.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0745\/5735\/8394\/files\/cb213de578f2ddd684ebadbd0483455056b95d3a.jpg-650Wx650H-2.jpg?v=1785799635","url":"https:\/\/gograva.com\/products\/shimano-ultegra-cs-r8101-12-speed-cassette-11-34","provider":"Grava Adventure Corporation","version":"1.0","type":"link"}