{"product_id":"shimano-cs-r8101-8100-12-speed-cassette-cog-12t-e-built-in-spacer-type","title":"Shimano 12-Speed Cassette Cog 12T (E) for Ultegra \u0026 Dura-Ace HG Road Drivetrains | Built-In Spacer, High-Performance Cycling Components","description":"\u003cdiv id=\"seqbpdescription-1\"\u003e\u003cp\u003eUpgrade your Shimano 12-speed road bike drivetrain with the high-performance Shimano CS-R8101\/8100 12-Speed Cassette Cog - 12t (E), Built-In Spacer Type. Designed for precision, durability, and seamless shifting, this replacement cog is an essential component for serious cyclists seeking enhanced gear transition and optimized power transfer.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-2\"\u003e\u003cp\u003eMaterials \u0026amp; Engineering:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-3\"\u003e\u003cp\u003eConstructed from high-quality, heat-treated steel, the Shimano CS-R8101\/8100 12-Speed Cassette Cog ensures long-lasting performance and resistance to wear. Its rugged build guarantees dependable operation under intense cycling conditions, making it ideal for both competitive racing and endurance riding.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-4\"\u003e\u003cp\u003ePerformance \u0026amp; Technology:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-5\"\u003e\u003cp\u003eTailored for Shimano's flagship road cycling cassettes-Ultegra CS-R8101 and CS-R8100, as well as the Dura-Ace CS-R9200-this 12-tooth cog provides precise, crisp gear shifts. Its advanced engineering facilitates smooth engagement and quick response across the 12-speed drivetrain, improving overall efficiency and rider confidence.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-6\"\u003e\u003cp\u003eComponents \u0026amp; Compatibility:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-7\"\u003e\u003cp\u003eFeaturing a built-in spacer design, this cassette cog is compatible with Shimano HG 11\/12-speed road cassette bodies, ensuring a straightforward installation process. Perfectly suited for Shimano's latest road groupsets, it guarantees optimal compatibility and maximum drivetrain performance.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-8\"\u003e\u003cp\u003eStyle \u0026amp; Use Case:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-9\"\u003e\u003cp\u003eWhether you're upgrading your racing bike, time trial setup, or high-performance endurance machine, this 12-tooth sprocket is engineered for speed and reliability. Its sleek, minimalistic design complements modern road bikes, while its performance-oriented features help you tackle challenging climbs, fast descents, and competitive events with confidence.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-10\"\u003e\u003cp\u003eInnovative Features:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-11\"\u003e\u003cp\u003eThe integrated spacer simplifies assembly, reducing setup time and maintaining precise gear alignment. Designed to work seamlessly with Shimano's advanced drivetrain systems, this component delivers consistent, high-level performance with every pedal stroke.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-12\"\u003e\u003cp\u003eOptimize your road cycling experience with the Shimano CS-R8101\/8100 12-Speed Cassette Cog - 12t (E). Engineered for durability, precision, and compatibility, it's the perfect upgrade for serious cyclists aiming for superior shifting and maximum efficiency on every ride.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpfeatures\"\u003e\u003cul\u003e\n\u003cli\u003eEnhance your 12-speed Shimano Ultegra and Dura-Ace cassette performance with this precision-engineered 12-tooth freehub cog, designed for seamless shifting and durability. \u003c\/li\u003e\n\u003cli\u003eConstructed from high-quality materials for optimal strength and lightweight performance, this Shimano CS-R8101\/8100 12T cog ensures smooth power transfer and longevity in demanding road cycling conditions. \u003c\/li\u003e\n\u003cli\u003eEngineered with built-in spacer technology, this cassette cog offers hassle-free installation and compatibility with Shimano HG 11\/12-speed road drivetrains, making upgrades quick and secure. \u003c\/li\u003e\n\u003cli\u003eIdeal for competitive road cyclists and serious enthusiasts, this 12T cog is a vital component for maintaining consistent gear performance and enhancing overall ride efficiency. \u003c\/li\u003e\n\u003cli\u003eDesigned to integrate seamlessly with Shimano Ultegra and Dura-Ace cassettes, this innovative cog provides precise gear indexing and is a perfect upgrade to optimize your high-performance road bike setup.\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/div\u003e","brand":"Shimano","offers":[{"title":"Default Title","offer_id":42872078204995,"sku":"CSCG0181","price":18.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1608\/6187\/files\/FW0809_c2120262-df56-4966-9593-3c0f5c1931e6.jpg?v=1773578139","url":"https:\/\/365cycles.com\/products\/shimano-cs-r8101-8100-12-speed-cassette-cog-12t-e-built-in-spacer-type","provider":"365 Cycles","version":"1.0","type":"link"}