{"product_id":"shimano-tiagra-st-r4020-11-speed-sti-lever-with-br-rs405-hydraulic-flat-mount-caliper-kit","title":"Shimano Tiagra ST-R4020 11-Speed STI Lever with BR-RS405 Hydraulic Flat Mount Caliper Kit","description":"\u003cp\u003eThe Shimano Tiagra ST-R4020 STI paired with the BR-RS405 flat mount caliper delivers a seamless blend of powerful hydraulic braking and precise 11-speed shifting. Designed with slim, ergonomic dual control levers, this component ensures effortless gear changes and superior brake control. The short shift arc matches natural hand movements, allowing rapid and accurate gear shifts that enhance your riding experience.\u003c\/p\u003e\n\n\u003cp\u003eExperience consistent stopping power with less effort, especially from the hood position, thanks to the hydraulic brake lever and automatic pad-to-rotor clearance adjustment. This kit includes everything you need—ST-R4020 STI lever, BR-RS405 caliper with pads, hose, and gear cable—ready to install (rotor and adapter sold separately). Its easy-to-maintain hydraulic system uses Shimano mineral oil, ensuring reliable performance on every ride.\u003c\/p\u003e\n\n\u003ch3\u003eWhat It’s Good For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eProviding smooth and reliable 11-speed shifting for road bikes\u003c\/li\u003e\n  \u003cli\u003eDelivering powerful, consistent hydraulic braking in all conditions\u003c\/li\u003e\n  \u003cli\u003eOffering ergonomic design for comfort and control during long rides\u003c\/li\u003e\n  \u003cli\u003eEnsuring easy maintenance with pre-bled hydraulic system\u003c\/li\u003e\n  \u003cli\u003eCompatibility with Shimano 11-speed chains and select rear derailleurs\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 non-Shimano 11-speed systems or incompatible rear derailleurs\u003c\/li\u003e\n  \u003cli\u003eInstallation without appropriate rotor and adapter (sold separately)\u003c\/li\u003e\n  \u003cli\u003eApplications outside road bikes, such as mountain biking or off-road use\u003c\/li\u003e\n  \u003cli\u003eUse with non-mineral hydraulic fluids, which may damage the system\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs the hydraulic system pre-bled?\u003c\/strong\u003e\u003cbr\u003eYes, the kit comes pre-bled for immediate installation and optimal performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this with any 11-speed Shimano rear derailleur?\u003c\/strong\u003e\u003cbr\u003eThis system is compatible specifically with RD-R4000 and RD-U6040 rear derailleurs to ensure precise shifting.\u003c\/p\u003e","brand":"Shimano Tiagra","offers":[{"title":"Black \/ Double \/ Left","offer_id":46690136981679,"sku":"RR4020LR","price":244.99,"currency_code":"GBP","in_stock":true},{"title":"Black \/ 11-Speed \/ Right","offer_id":46690137014447,"sku":"RR4020RF","price":244.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0654\/2003\/4223\/files\/rr4020lr.jpg?v=1773923224","url":"https:\/\/www.swinnertoncycles.co.uk\/products\/shimano-tiagra-st-r4020-11-speed-sti-lever-with-br-rs405-hydraulic-flat-mount-caliper-kit","provider":"Swinnerton Cycles","version":"1.0","type":"link"}