{"product_id":"is127775","title":"Shimano GRX RD-RX820 Rear Derailleur 12 Speed Shadow Plus 36T Take Off","description":"\u003cp\u003e\u003cstrong\u003eProduct Description\u003c\/strong\u003e\u003cbr\u003eThe Shimano GRX RD-RX820 rear derailleur is built for smooth, secure \u003cstrong\u003e12-speed gravel shifting\u003c\/strong\u003e across mixed terrain. Designed around Shimano’s GRX gravel platform, it is compatible with \u003cstrong\u003e11-34T\u003c\/strong\u003e and \u003cstrong\u003e11-36T\u003c\/strong\u003e 12-speed cassettes, giving riders a wide usable range for steep climbs, rolling gravel, and fast mixed-surface riding.\u003c\/p\u003e\n\n\u003cp\u003eAn integrated \u003cstrong\u003echain stabilizer\u003c\/strong\u003e helps reduce chain slap and improve chain security on rough rides, while Shimano’s \u003cstrong\u003eShadow RD+\u003c\/strong\u003e design keeps the drivetrain quieter and more controlled. The stabilizer can be switched \u003cstrong\u003eON or OFF\u003c\/strong\u003e depending on terrain and rider preference.\u003c\/p\u003e\n\n\u003cp\u003eThis derailleur is in \u003cstrong\u003etake-off condition\u003c\/strong\u003e and may show \u003cstrong\u003elight handling marks, small scuffs, or minor signs of installation\/removal\u003c\/strong\u003e. Any wear present is expected to be \u003cstrong\u003ecosmetic only\u003c\/strong\u003e unless otherwise noted.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eGenuine \u003cstrong\u003eShimano GRX RD-RX820\u003c\/strong\u003e rear derailleur\u003c\/li\u003e\n\u003cli\u003eDesigned for \u003cstrong\u003e12-speed\u003c\/strong\u003e gravel drivetrains\u003c\/li\u003e\n\u003cli\u003eCompatible with \u003cstrong\u003e11-34T\u003c\/strong\u003e and \u003cstrong\u003e11-36T\u003c\/strong\u003e cassettes\u003c\/li\u003e\n\u003cli\u003eIntegrated \u003cstrong\u003eShadow RD+\u003c\/strong\u003e chain stabilizer\u003c\/li\u003e\n\u003cli\u003eHelps reduce chain slap and dropped chains\u003c\/li\u003e\n\u003cli\u003eQuiet, stable shifting on rough terrain\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eON\/OFF\u003c\/strong\u003e stabilizer switch to match terrain\u003c\/li\u003e\n\u003cli\u003eCompatible with \u003cstrong\u003eHG 12-speed chains\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTake-off condition\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eBrand: Shimano\u003c\/li\u003e\n\u003cli\u003eSeries: GRX\u003c\/li\u003e\n\u003cli\u003eModel: \u003cstrong\u003eRD-RX820\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eProduct Type: Rear Derailleur\u003c\/li\u003e\n\u003cli\u003eDrivetrain Speeds: \u003cstrong\u003e12\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eLargest Cog: \u003cstrong\u003e36T\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eChain Wrap Capacity: \u003cstrong\u003e42T\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eRear Derailleur \/ Shifter Compatibility: \u003cstrong\u003eShimano Road\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eRear Derailleur Mount Type: \u003cstrong\u003eShimano Rear Direct Mount, 10x1 Standard\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight: \u003cstrong\u003e270g\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eManufacturer Part Number: \u003cstrong\u003eIRDRX820\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003cbr\u003eCompatible with:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eShimano \u003cstrong\u003e12-speed road \/ GRX\u003c\/strong\u003e drivetrain systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e11-34T\u003c\/strong\u003e and \u003cstrong\u003e11-36T\u003c\/strong\u003e 12-speed cassettes\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHG 12-speed chains\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eFrames using a \u003cstrong\u003estandard 10x1 derailleur mount\u003c\/strong\u003e or compatible \u003cstrong\u003eShimano Rear Direct Mount\u003c\/strong\u003e setup\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003ePlease confirm cassette range, hanger style, chain compatibility, and shifter compatibility before purchase.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIncluded\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\u003cli\u003eOne Shimano GRX RD-RX820 rear derailleur\u003c\/li\u003e\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWarranty and Notes\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTake-off condition\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eMay show \u003cstrong\u003eslight handling marks or small cosmetic scuffs\u003c\/strong\u003e from installation or removal\u003c\/li\u003e\n\u003cli\u003eIncludes only what is shown or described\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eTake-off\u003c\/li\u003e\n\u003cli\u003eMay show minor cosmetic marks from handling or removal\u003c\/li\u003e\n\u003cli\u003eNo known structural damage\u003c\/li\u003e\n\u003cli\u003eGenuine OEM product\u003c\/li\u003e\n\u003cli\u003eIncludes only what is shown or described\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Shimano","offers":[{"title":"Default","offer_id":48310116483284,"sku":"is127775","price":79.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0641\/7262\/2036\/files\/is127775-01.jpg?v=1784228478","url":"https:\/\/outlet.wheelandsprocket.com\/products\/is127775","provider":"Wheel \u0026 Sprocket - Outlet","version":"1.0","type":"link"}