{"product_id":"shimano-grx-rd-rx812-rear-derailleur","title":"Shimano GRX RD-RX812 Rear Derailleur","description":"\u003cdiv\u003e\n\u003cp\u003eThe \u003cstrong\u003eShimano GRX RD-RX812 Rear Derailleur\u003c\/strong\u003e is built for riders who take gravel seriously — the kind of terrain where a rear derailleur needs to handle rough surfaces, loose chain tension, and the occasional rock strike without complaint. It's the rear derailleur at the heart of Shimano's 11-speed mechanical gravel groupset, and it carries some clear influence from the mountain bike side of the catalogue.\u003c\/p\u003e\n\n\u003cp\u003eThe most practical feature for off-road riding is the integrated chain stabilizer, which reduces chain slap and keeps the drivetrain quieter on rough ground. You can switch it on or off depending on conditions — leave it active on chunky gravel or trail, turn it off on smoother surfaces. The derailleur also sits low and close to the frame, a deliberate design choice that reduces exposure in a crash and helps protect the mechanism when the trail gets tight. It runs 11-speed and supports cassettes up to 42T, giving you the gear range to handle steep climbs without sacrificing top-end gearing on faster sections.\u003c\/p\u003e\n\n\u003ch3\u003eShimano GRX RD-RX812 Rear Derailleur Specs at a Glance\u003c\/h3\u003e\n\u003cul class=\"specs_at_a_glance\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpeed:\u003c\/strong\u003e 11-speed\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChainring compatibility:\u003c\/strong\u003e 1x or 2x\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax low sprocket:\u003c\/strong\u003e 42T\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTotal capacity:\u003c\/strong\u003e 31T\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 267g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Shimano","offers":[{"title":"Black","offer_id":43583182602284,"sku":"IRDRX812","price":145.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/7684\/9196\/files\/shimano-grx-rd-rx812-rear-derailleur-4785881.jpg?v=1771295227","url":"https:\/\/ricycles.com\/products\/shimano-grx-rd-rx812-rear-derailleur","provider":"RA Cycles","version":"1.0","type":"link"}