{"product_id":"shimano-grx-rd-rx820-2x12-speed-rear-derailleur","title":"SHIMANO GRX RD-RX820 2x12-SPEED REAR DERAILLEUR","description":"\u003ch3\u003eThe Shimano GRX RD-RX820 is a 2 x 12-speed rear derailleur engineered for gravel and mixed-terrain riding. Its integrated chain stabilizer reduces bounce and chatter on rough surfaces, with an ON\/OFF switch to deactivate it on smooth roads.\u003c\/h3\u003e\n\u003cp\u003eThe Shadow Plus design delivers precise, quiet shifting, while the cold-forged aluminium construction keeps weight minimal without compromising durability. Compatible with 12-speed Hyperglide+ chains and cassettes up to 36T, this derailleur pairs perfectly with double chainsets for versatile gear ratios. An essential upgrade for gravel cyclists demanding reliable performance across all terrains.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eFeatures \u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eShimano GRX, with its gravel specific ergonomics, optimized gearing options, rugged reliability, and quiet and stable drivetrain, sets itself apart from the rest of the component world\u003c\/li\u003e\n\u003cli\u003eLow profile Shadow Plus design 12-speed rear derailleur for fast and precise shifting performance\u003c\/li\u003e\n\u003cli\u003eShadow Plus uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shifting\u003c\/li\u003e\n\u003cli\u003eHigh tolerance cold forged aluminium link plates and body construction is extremely light and durable\u003c\/li\u003e\n\u003cli\u003eCompatible with 12-speed Hyperglide+ chains\u003c\/li\u003e\n\u003cli\u003eWide gear ratio compatible up to 11-36T\u003c\/li\u003e\n\u003cli\u003eFor use with double chainset\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecification\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse: \u003c\/strong\u003eGravel, Cyclocross\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGroup:\u003c\/strong\u003e GRX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel: \u003c\/strong\u003eRD-RX820\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount: \u003c\/strong\u003eDirect attachment (Conventional)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTechnology:\u003c\/strong\u003e Shadow RD+\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGear front:\u003c\/strong\u003e 2-speed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGear rear:\u003c\/strong\u003e 12-speed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Chain:\u003c\/strong\u003e 12-speed HG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax. teeth large sprocket:\u003c\/strong\u003e 36T\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMin. teeth large sprocket:\u003c\/strong\u003e 34T\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax. teeth small sprocket:\u003c\/strong\u003e 11T\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMin. teeth small sprocket:\u003c\/strong\u003e 11T\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax. Front Difference:\u003c\/strong\u003e 17T\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal Capacity: \u003c\/strong\u003e42T\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMaterial\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAluminium\u003c\/li\u003e\n\u003cli\u003eSteel\u003c\/li\u003e\n\u003cli\u003eGFRP\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eColour\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBlack\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWeight\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eApprox. 270g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eContents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Shimano GRX 2x12-speed RD-RX820 Rear Derailleur\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SHIMANO","offers":[{"title":"Default Title","offer_id":56834429288823,"sku":"RDRX820","price":110.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/2350\/2370\/files\/rdrx820.jpg?v=1772708569","url":"https:\/\/www.allterraincycles.co.uk\/products\/shimano-grx-rd-rx820-2x12-speed-rear-derailleur","provider":"allterraincycles","version":"1.0","type":"link"}