Shimano GRX RD-RX812 Rear Derailleur

$145⁰⁰

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Color

Black

Typically ships within 5-8 business days.

Shimano | SKU: IRDRX812 | Option: Black

This product is HSA / FSA eligible

Pickup available at RA Cycles - Brooklyn

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Shimano GRX RD-RX812 Rear Derailleur Info

The Shimano GRX RD-RX812 Rear Derailleur 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.

The 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.