{"product_id":"shimano-grx-rx820-rear-derailleur","title":"Shimano GRX RX820 Rear Derailleur","description":"\u003cdiv\u003e\n\u003cp\u003eThe \u003cstrong\u003eShimano GRX RX820 Rear Derailleur\u003c\/strong\u003e is built for gravel riding's demands — unpredictable terrain, variable cadence, and the kind of abuse that exposes weak links in a drivetrain fast. Part of Shimano's dedicated gravel groupset, it handles a 12-speed system with the mechanical authority you'd expect from a component designed specifically for off-road use.\u003c\/p\u003e\n\n\u003cp\u003eThe Shadow RD+ technology keeps chain noise and movement in check on rough ground — the built-in chain stabilizer dampens the erratic chain slap that comes with gravel and dirt riding. Crucially, the stabilizer can be switched off when you're on smoother surfaces, giving you a cleaner, freer-feeling drivetrain without any tools. Shifting stays consistent and near-silent across the cassette, whether you're grinding a long climb or spinning out on a fast descent.\u003c\/p\u003e\n\n\u003ch3\u003eShimano GRX RX820 Rear Derailleur Specs at a Glance\u003c\/h3\u003e\n\u003cul class=\"specs_at_a_glance\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpeeds:\u003c\/strong\u003e 12-speed\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTechnology:\u003c\/strong\u003e Shadow RD+ with switchable chain stabilizer\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Black\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Shimano GRX RX820 groupset\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Gravel \/ off-road\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Shimano","offers":[{"title":"Black","offer_id":43520176717868,"sku":"IRDRX820","price":145.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/7684\/9196\/files\/shimano-grx-rx820-rear-derailleur-5465609.jpg?v=1771297811","url":"https:\/\/ricycles.com\/products\/shimano-grx-rx820-rear-derailleur","provider":"RA Cycles","version":"1.0","type":"link"}