{"product_id":"shimano-ultegra-cs-r8101-12-cassette","title":"Shimano Ultegra CS-R8101-12 Cassette","description":"\u003ch2 data-path-to-node=\"3\"\u003eShimano Ultegra CS-R8101-12 Cassette\u003c\/h2\u003e\n\u003cp data-path-to-node=\"4\"\u003eLeave time behind and master every road profile. The \u003cb data-index-in-node=\"53\" data-path-to-node=\"4\"\u003eShimano Ultegra CS-R8101-12\u003c\/b\u003e is the benchmark 12-speed road cassette, engineered for riders who demand elite-tier racing performance without compromise. Drawing from the pinnacle technology of Shimano's flagship Dura-Ace range, this cassette features nickel-plated steel sprockets mounted on dual, lightweight aluminium spiders. It delivers an exceptionally stiff, highly responsive platform that handles explosive flat-out sprints and heavy climbing torque with absolute ease.\u003c\/p\u003e\n\u003cp data-path-to-node=\"5\"\u003eThe standout feature of the CS-R8101 is its implementation of \u003cb data-index-in-node=\"62\" data-path-to-node=\"5\"\u003eHyperglide+\u003c\/b\u003e technology. Originally developed to conquer extreme mountain bike trails, this technology has been refined for the tarmac. Precision-engineered shifting ramps guide the chain seamlessly up and down the cog cluster. This allows you to shift under maximum load—whether you are pulling a hard turn out of the saddle or clawing up a brutal alpine pass—without catching, skipping, or interrupting your cadence.\u003c\/p\u003e\n\u003ch5 data-path-to-node=\"7\"\u003eDual-Ratio Options for Every Route\u003c\/h5\u003e\n\u003cp data-path-to-node=\"8\"\u003eWe offer this premium 12-speed Ultegra cassette in two carefully balanced ratios, keeping you perfectly positioned within your sweet-spot cadence:\u003c\/p\u003e\n\u003ch6 data-path-to-node=\"9\"\u003e1. The 11-30T Ratio (Racer \u0026amp; Criterium Spec)\u003c\/h6\u003e\n\u003cul data-path-to-node=\"10\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,0,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"10,0,0\"\u003eThe Perfect Choice For:\u003c\/b\u003e Flat-to-rolling terrain, crit racing, and riders who prefer tight, progressive gear jumps to maintain a precise cadence.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,1,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"10,1,0\"\u003eGear Steps:\u003c\/b\u003e 11-12-13-14-15-16-17-19-21-24-27-30T\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,2,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"10,2,0\"\u003eWhy Choose It:\u003c\/b\u003e Keeps gear steps extremely small in the crucial cruising speeds, allowing you to fine-tune your effort with laser precision.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,3,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"10,3,0\"\u003eWeight:\u003c\/b\u003e ~291 g\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6 data-path-to-node=\"11\"\u003e2. The 11-34T Ratio (All-Road \u0026amp; Alpine Spec)\u003c\/h6\u003e\n\u003cul data-path-to-node=\"12\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,0,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"12,0,0\"\u003eThe Perfect Choice For:\u003c\/b\u003e High-altitude mountain passes, steep rolling hills, endurance road riding, and gravel excursions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,1,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"12,1,0\"\u003eGear Steps:\u003c\/b\u003e 11-12-13-14-15-17-19-21-24-27-30-34T\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,2,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"12,2,0\"\u003eWhy Choose It:\u003c\/b\u003e Gives you an ultra-low gear ratio (often achieving a 1:1 ratio when paired with compact road chainrings) to conquer incredibly steep climbs while maintaining a smooth, non-fatiguing seated pedaling rhythm.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,3,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"12,3,0\"\u003eWeight:\u003c\/b\u003e ~345 g\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6 data-path-to-node=\"14\"\u003eKey Technologies\u003c\/h6\u003e\n\u003cul data-path-to-node=\"15\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"15,0,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"15,0,0\"\u003eHyperglide+ Dual-Direction Shifting:\u003c\/b\u003e Experience lightning-fast, silent shifts even under full sprint loads or steep-climbing torque.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"15,1,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"15,1,0\"\u003eSweet-Spot Gear Steps:\u003c\/b\u003e Optimised mid-cassette gear steps ensure you can maintain peak pedaling efficiency where it matters most.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"15,2,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"15,2,0\"\u003eForward and Backward Compatibility:\u003c\/b\u003e Designed with a versatile spline profile that fits standard Shimano Road 11-speed freehub bodies as well as modern dedicated 12-speed HG Spline L2 road freehub bodies.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"15,3,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"15,3,0\"\u003eAll-Steel Durability:\u003c\/b\u003e Solid steel construction across all 12 cogs ensures long-term wear resistance and structural integrity, delivering consistent shifting mile after mile.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6 data-path-to-node=\"17\"\u003eTechnical Specifications\u003c\/h6\u003e\n\u003cul data-path-to-node=\"18\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,0,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"18,0,0\"\u003eModel Series:\u003c\/b\u003e Ultegra R8100 Series\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,1,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"18,1,0\"\u003eSpeed Compatibility:\u003c\/b\u003e 12-speed\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,2,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"18,2,0\"\u003eSystem Type:\u003c\/b\u003e HG 12-speed (Hyperglide+)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,3,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"18,3,0\"\u003eSpider Arm Construction:\u003c\/b\u003e 2x Aluminium spider arms\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,4,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"18,4,0\"\u003eSprocket Material:\u003c\/b\u003e Nickel-plated steel\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,5,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"18,5,0\"\u003eLockring Material:\u003c\/b\u003e Anodised aluminium\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,6,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"18,6,0\"\u003eCompatible Chains:\u003c\/b\u003e HG 12-speed (e.g., CN-M8100, CN-M9100)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6 data-path-to-node=\"20\"\u003ePros \u0026amp; \u003cspan style=\"color: rgb(255, 0, 0);\"\u003eCons\u003c\/span\u003e\n\u003c\/h6\u003e\n\u003cul data-path-to-node=\"21\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"21,0,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"21,0,0\"\u003eHyperglide+ technology\u003c\/b\u003e enables flawless, shudder-free shifts under full load (up and down the cassette)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"21,1,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"21,1,0\"\u003eHigh-grade steel sprockets\u003c\/b\u003e deliver exceptional durability and a longer wear life compared to cassettes utilising soft titanium or aluminium cogs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"21,2,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"21,2,0\"\u003eDual compatibility\u003c\/b\u003e means it fits onto your existing 11-speed wheels as well as newer 12-speed road wheelsets\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"21,3,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"21,3,0\"\u003eExtremely smooth gear transitions\u003c\/b\u003e prevent sudden cadence drops, especially in the 11-30T configurati\u003cspan style=\"color: rgb(0, 0, 0);\"\u003eon\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"color: rgb(255, 0, 0);\"\u003e\n\u003cp data-path-to-node=\"21,4,0\"\u003e\u003cspan style=\"color: rgb(255, 0, 0);\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"21,4,0\"\u003eSlightly heavier\u003c\/b\u003e than its Dura-Ace sibling, as it uses robust nickel-plated steel rather than exotic, lightweight titanium cogs for the largest gears\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"color: rgb(255, 0, 0);\"\u003e\n\u003cp data-path-to-node=\"21,5,0\"\u003e\u003cspan style=\"color: rgb(255, 0, 0);\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"21,5,0\"\u003eRequires a dedicated 12-speed chain\u003c\/b\u003e and Hyperglide+ compatible derailleur to unlock the full dual-direction shifting benefit\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" href=\"https:\/\/si.shimano.com\/en\/pdfs\/um\/1M90A\/UM-1M90A-005-ENG.pdf\" target=\"_blank\"\u003e\u003cspan\u003eCS-R8101-12 User Manual\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/bike.shimano.com\/en-UK\/support-and-service\/warranty.html\"\u003eShimano Warranty\u003c\/a\u003e\u003c\/p\u003e","brand":"Shimano","offers":[{"title":"11-30T","offer_id":58282608394588,"sku":"ICSR810112130","price":89.95,"currency_code":"EUR","in_stock":true},{"title":"11-34T","offer_id":58282608427356,"sku":"ICSR810112134","price":94.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0996\/2599\/2540\/files\/shimano_ultegra_CS-R8101-12_front_sq800.png?v=1784100788","url":"https:\/\/bicyquel.eu\/products\/shimano-ultegra-cs-r8101-12-cassette","provider":"bicyquel _","version":"1.0","type":"link"}