{"product_id":"grx-rd-rx820-12-speed-rear-derailleur-17u78","title":"Shimano GRX RD-RX820 12-Speed Rear Derailleur","description":"\u003cp\u003e\u003cstrong\u003ePerformance\u003c\/strong\u003e\u003cbr\u003e\nBuilt for gravel, the GRX RD-RX820 delivers silent, secure 12-speed shifting on rough and mixed terrain. Shimano's Shadow RD+ design with an adjustable chain stabiliser prevents chain slap and drops, and an ON\/OFF stabiliser switch lets you match the setup to the terrain. The low-profile body reduces the risk of crash damage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eOptions\u003c\/strong\u003e\u003cbr\u003e\nAvailable in 36T, 46T and 51T maximum-sprocket versions to suit different cassette ranges - the wider-capacity options support mullet and wide-range setups. Select the version that matches your cassette.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCassette Compatibility\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e36T:\u003c\/strong\u003e  Top sprocket: Max. 11T\/Min. 11T\u003cbr\u003e\nLow sprocket: Max. 36T\/Min. 34T\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e46T: \u003c\/strong\u003eTop sprocket: Max. 10T\/Min. 10T\u003cbr\u003e\nLow sprocket: Max. 45T\/Min. 45T\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e51T: \u003c\/strong\u003eTop sprocket: Max. 10T\/Min. 10T\u003cbr\u003e\nLow sprocket: Max. 51T\/Min. 51T\u003c\/p\u003e","brand":"Shimano","offers":[{"title":"36T \/ Black","offer_id":54308164665690,"sku":"1731911","price":69.0,"currency_code":"GBP","in_stock":true},{"title":"46T \/ Black","offer_id":54308164698458,"sku":"1731914","price":69.0,"currency_code":"GBP","in_stock":true},{"title":"51T \/ Black","offer_id":54308164731226,"sku":"1731917","price":69.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0956\/0827\/5290\/files\/Shimano-GRX-RD-RX820-12-Speed-Rear-Derailleur-Max-51T.jpg?v=1781538977","url":"https:\/\/checkout.sigmasports.com\/products\/grx-rd-rx820-12-speed-rear-derailleur-17u78","provider":"Sigma Sports","version":"1.0","type":"link"}