{"product_id":"shimano-rs900-dura-ace-r9100-rear-mech-outer-casing","title":"Shimano RS900 Dura-Ace R9100 Rear Derailleur Outer Casing for Smooth Shifting","description":"\u003cp\u003eThe Shimano RS900 Dura-Ace R9100 Rear Mech Outer Casing is engineered for precision and reliability, tailored specifically for the Dura-Ace R9100 rear derailleur. This pack includes 10 pieces of 240 mm outer casings with a 4 mm diameter, designed to enhance your bike's transmission system. Featuring a more pliable construction than the standard SP41 casing, it ensures optimal compatibility with the Shadow derailleur, which lacks a B-tension spring.\u003c\/p\u003e\n\n\u003cp\u003eInternally lubricated with low-friction silicon grease, the casing minimizes cable friction for smoother shifting performance. Its special axial stiffness guarantees fast and accurate transmission of shifting movements, while a polymer sheath lining supports the effortless glide of the 1.2 mm diameter polymer-coated inner wires. Upgrade your gear cables with this high-quality component to maintain Shimano’s iconic precision and reliability.\u003c\/p\u003e\n\n\u003ch3\u003eWhat It’s Good For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eEnsuring precise and responsive shifting compatible with Dura-Ace R9100 Shadow derailleur\u003c\/li\u003e\n  \u003cli\u003eReducing cable friction through internal lubrication for smooth gear changes\u003c\/li\u003e\n  \u003cli\u003eProviding axial stiffness for accurate transmission of shifting movements\u003c\/li\u003e\n  \u003cli\u003eEnhancing durability with polymer sheath protection for inner wires\u003c\/li\u003e\n  \u003cli\u003eOptimizing performance when used with 1.2 mm diameter polymer-coated inner wires\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat It’s NOT Good For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eUse with derailleurs other than Shimano Dura-Ace R9100 may not deliver optimal results\u003c\/li\u003e\n  \u003cli\u003eNot suitable for inner wires larger or smaller than 1.2 mm diameter\u003c\/li\u003e\n  \u003cli\u003eMay not perform as intended if combined with non-compatible outer casings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs this outer casing compatible with other Shimano derailleurs?\u003c\/strong\u003e\u003cbr\u003eThis casing is specifically designed for the Dura-Ace R9100 Shadow rear derailleur and may not provide ideal performance with other models.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this casing with any inner wire?\u003c\/strong\u003e\u003cbr\u003eFor optimal shifting, use it with 1.2 mm diameter polymer-coated inner wires as recommended by Shimano.\u003c\/p\u003e","brand":"Shimano","offers":[{"title":"Black \/ 4 mm","offer_id":47380193706159,"sku":"OTRS900BOX01","price":44.91,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0654\/2003\/4223\/files\/y0bm98011.jpg?v=1787135454","url":"https:\/\/www.swinnertoncycles.co.uk\/products\/shimano-rs900-dura-ace-r9100-rear-mech-outer-casing","provider":"Swinnerton Cycles","version":"1.0","type":"link"}