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Shimano GRX RD-RX812 Rear Derailleur
Sale price
$145.00
Regular price
$145.00
Prices subject to change. How pricing works →
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In Stock Ships in 1-2 weeks based on its location
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SKU: IRDRX812 Option: Black
Pickup available at RA Cycles Brooklyn
Pickup available at RA Cycles Walnut Creek
Qualifying customers may be able to pay with their HSA or FSA through Flex. Flex disclosures (opens in a new tab)
Stock Availability by Location
RA Cycles Brooklyn In stockLow stock (1 left)Low stock (2 left)— Out of stock— Not immediately available
105 5th Ave, Brooklyn, NY 11217718-636-5242
* Available for in-store pickup in 2-4 hours
* Available for in-store pickup in 2-4 hours
* Available for in-store pickup in 2-4 hours
RA Cycles Walnut Creek In stockLow stock (1 left)Low stock (2 left)— Out of stock— Not immediately available
2099 Mt Diablo Blvd, Walnut Creek, CA 94596925-433-7099
* Available for in-store pickup in 2-4 hours
* Available for in-store pickup in 2-4 hours
* Available for in-store pickup in 2-4 hours
Distribution Center - East In stockLow stock (1 left)Low stock (2 left)— Out of stock— Not immediately available
Distribution Center - Central In stockLow stock (1 left)Low stock (2 left)— Out of stock— Not immediately available
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Shimano GRX RD-RX812 Rear Derailleur
$145.00
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.
Shimano GRX RD-RX812 Rear Derailleur Specs at a Glance
- Speed: 11-speed
- Chainring compatibility: 1x or 2x
- Max low sprocket: 42T
- Total capacity: 31T
- Weight: 267g
Shimano GRX RD-RX812 Rear Derailleur Video
PRICE MATCH GUARANTEE
We will price match against advertised or quoted prices from other authorized dealers of the product!