{"product_id":"shimano-ultegra-fc-r8100-12speed","title":"Shimano Ultegra FC-R8100 12Speed","description":"\u003cp data-path-to-node=\"2\"\u003e\u003cb data-path-to-node=\"2\" data-index-in-node=\"0\"\u003eThe Science of Speed.\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"3\" id=\"p-rc_a16f942b97db79aa-287\"\u003eThe Ultegra FC-R8100 is engineered for the rider who demands maximum power transfer without an ounce of wasted energy. \u003cspan class=\"citation-541\"\u003eUtilizing Shimano’s iconic \u003c\/span\u003e\u003cb data-path-to-node=\"3\" data-index-in-node=\"146\"\u003e\u003cspan class=\"citation-541\"\u003eHollowtech II\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-541 citation-end-541\"\u003e construction, the crank arms and chainrings are forged to be incredibly light and hollow while remaining remarkably stiff.\u003csup class=\"superscript\" data-turn-source-index=\"1\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e This ensures that every watt you put into the pedals is converted directly into forward momentum, whether you’re sprinting for a finish line or grinding up a steep alpine pass.\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"4\"\u003e\u003cb data-path-to-node=\"4\" data-index-in-node=\"0\"\u003eWhy the FC-R8100 is the Industry Standard:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"5\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,0,0\"\u003e\u003cb data-path-to-node=\"5,0,0\" data-index-in-node=\"0\"\u003eHollowtech II Construction:\u003c\/b\u003e By integrating the bottom bracket axle with the right crank arm, Shimano provides a wider bearing stance and a lighter weight-to-stiffness ratio than traditional designs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,1,0\" id=\"p-rc_a16f942b97db79aa-288\"\u003e\u003cb data-path-to-node=\"5,1,0\" data-index-in-node=\"0\"\u003eRefined 12Speed Gearing:\u003c\/b\u003e\u003cspan class=\"citation-540 citation-end-540\"\u003e Optimized specifically for Shimano’s 12Speed ecosystem, the chainrings feature precise tooth profiles that ensure instantaneous, silent front shifting, even under heavy pedaling loads.\u003csup class=\"superscript\" data-turn-source-index=\"2\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,2,0\"\u003e\u003cb data-path-to-node=\"5,2,0\" data-index-in-node=\"0\"\u003eAero-Optimized Design:\u003c\/b\u003e The sleek, integrated look isn't just for show, the crankset’s smooth surfaces reduce wind resistance and give your bike a modern, high-end aesthetic.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,3,0\" id=\"p-rc_a16f942b97db79aa-289\"\u003e\u003cb data-path-to-node=\"5,3,0\" data-index-in-node=\"0\"\u003eBroad Compatibility:\u003c\/b\u003e\u003cspan class=\"citation-539 citation-end-539\"\u003e Available in a wide range of crank arm lengths (160mm to 175mm) and gear ratios (50\/34T and 52\/36T), allowing you to customize your mechanical advantage for your specific terrain.\u003csup class=\"superscript\" data-turn-source-index=\"3\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,4,0\"\u003e\u003cb data-path-to-node=\"5,4,0\" data-index-in-node=\"0\"\u003eReliable Power Transfer:\u003c\/b\u003e The 24mm steel spindle remains the gold standard for bottom bracket reliability, offering a creak-free interface and easy serviceability across almost all frame types.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"6\"\u003e\u003cb data-path-to-node=\"6\" data-index-in-node=\"0\"\u003eTechnical Specifications:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"7\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,0,0\"\u003e\u003cb data-path-to-node=\"7,0,0\" data-index-in-node=\"0\"\u003eSeries:\u003c\/b\u003e Ultegra R8100\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,1,0\"\u003e\u003cb data-path-to-node=\"7,1,0\" data-index-in-node=\"0\"\u003eSpeed:\u003c\/b\u003e 2x12Speed\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,2,0\" id=\"p-rc_a16f942b97db79aa-290\"\u003e\u003cspan class=\"citation-538\"\u003e\u003c\/span\u003e\u003cb data-path-to-node=\"7,2,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"citation-538\"\u003eChainring Options:\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-538 citation-end-538\"\u003e 50-34T (Endurance\/Climbing) or 52-36T (Semi-Compact\/Racing)\u003csup class=\"superscript\" data-turn-source-index=\"4\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,3,0\"\u003e\u003cb data-path-to-node=\"7,3,0\" data-index-in-node=\"0\"\u003eCrank Arm Material:\u003c\/b\u003e Aluminum (Anodized)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,4,0\"\u003e\u003cb data-path-to-node=\"7,4,0\" data-index-in-node=\"0\"\u003eSpindle Interface:\u003c\/b\u003e 24mm (Hollowtech II)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,5,0\" id=\"p-rc_a16f942b97db79aa-291\"\u003e\u003cspan class=\"citation-537\"\u003e\u003c\/span\u003e\u003cb data-path-to-node=\"7,5,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"citation-537\"\u003eChainline:\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-537 citation-end-537\"\u003e 44.5mm\u003csup class=\"superscript\" data-turn-source-index=\"5\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,6,0\"\u003e\u003cb data-path-to-node=\"7,6,0\" data-index-in-node=\"0\"\u003eWeight:\u003c\/b\u003e Approx. 700g (50-34T)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-path-to-node=\"8\"\u003e\n\u003cp data-path-to-node=\"9\"\u003e \u003c\/p\u003e\n\u003cp data-path-to-node=\"9,0\" id=\"p-rc_a16f942b97db79aa-292\"\u003e\u003cb data-path-to-node=\"9,0\" data-index-in-node=\"0\"\u003eThe Alegro Perspective:\u003c\/b\u003e In our shop, Ultegra is the \"pro’s secret.\" It offers 99% of the performance of Dura-Ace at a significantly more accessible price point. \u003cspan class=\"citation-536 citation-end-536\"\u003eThe R8100 version, in particular, has mastered front shifting—it's so fast and reliable that you’ll find yourself shifting into the big ring more often just to feel it happen.\u003csup class=\"superscript\" data-turn-source-index=\"6\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"10\"\u003e\u003cb data-path-to-node=\"10\" data-index-in-node=\"0\"\u003eElite Stiffness. Precision Shifting. Power your Ride with Shimano Ultegra.\u003c\/b\u003e\u003c\/p\u003e","brand":"Shimano","offers":[{"title":"50\/34T \/ 160mm","offer_id":48554243162335,"sku":null,"price":455.0,"currency_code":"CAD","in_stock":false},{"title":"50\/34T \/ 165mm","offer_id":48554243195103,"sku":null,"price":455.0,"currency_code":"CAD","in_stock":false},{"title":"50\/34T \/ 170mm","offer_id":48554243227871,"sku":null,"price":455.0,"currency_code":"CAD","in_stock":false},{"title":"50\/34T \/ 172.5mm","offer_id":48554243260639,"sku":null,"price":455.0,"currency_code":"CAD","in_stock":false},{"title":"50\/34T \/ 175mm","offer_id":48554243293407,"sku":null,"price":455.0,"currency_code":"CAD","in_stock":false},{"title":"52\/36T \/ 160mm","offer_id":48554243326175,"sku":null,"price":455.0,"currency_code":"CAD","in_stock":false},{"title":"52\/36T \/ 165mm","offer_id":48554243358943,"sku":null,"price":455.0,"currency_code":"CAD","in_stock":true},{"title":"52\/36T \/ 170mm","offer_id":48554243391711,"sku":"IFCR8100CX26","price":455.0,"currency_code":"CAD","in_stock":false},{"title":"52\/36T \/ 172.5mm","offer_id":48554243424479,"sku":null,"price":455.0,"currency_code":"CAD","in_stock":false},{"title":"52\/36T \/ 175mm","offer_id":48554243457247,"sku":null,"price":455.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/5452\/3103\/files\/350825-01_1.jpg?v=1772297844","url":"https:\/\/alegrocycles.com\/products\/shimano-ultegra-fc-r8100-12speed","provider":"Alegro Cycles","version":"1.0","type":"link"}