GRX RD-RX820 12-Speed Rear Derailleur
10% off with code BF2026
Shimano

GRX RD-RX820 12-Speed Rear Derailleur

$184.99
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UPC / SKU
UPC
192790303611
SKU
IRDRX820
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GRX RD-RX820 12-Speed Rear Derailleur $184.99
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The Shimano RD-RX820 rear derailleur is compatible with 11-34t and 11-36t 12-speed cassettes, providing a wide gear range so you can spin a comfortable cadence no matter the terrain type. This rear derailleur also features an integrated chain stabilizer that delivers quieter shifting and more secure chain management during rough rides. The chain tensioner has an ON/OFF switch for outings on smooth surfaces. Silent and secure rear shifting on rough terrain Adjustable chain stabilizer prevents chain slap and drops Shimano Shadow RD+ offers less distraction, a quiet drive train, reduced chain slap and a solution for chain drop ON/OFF stabilizer switch matches terrain for smooth and reliable shifting on mixed surfaces Compatible with HG 12-Speed Chains

Bike shipping: $100 for non-electric bikes; $250 for e-bikes.

Higher rates apply to certain long-distance destinations, including Newfoundland and Labrador. Additional charges may apply to remote or rural locations and oversized or overweight items.

Free standard shipping on eligible orders over $150, excluding bikes and e-bikes.

Your shipping charge is shown at checkout before you place your order.

Signature required on delivery for all bikes and e-bikes, deliveries to apartment buildings, and orders of $300 or more.

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  • Request deadline: Within 7 days of receiving your bike or 14 days of receiving other items.
  • Condition: Brand-new, never used, and in original packaging. Bikes must be never ridden.
  • Final sale: Sale and special-order items cannot be returned or exchanged. A discount code on a regular-price item does not make it final sale.
  • Return deadline: Approved items must reach us within 7 days of approval.
  • Processing fee: 5% of the amount paid for returned items, excluding taxes and shipping, is deducted from your refund—even for returns brought to a store.
  • Shipping: You pay return shipping or may bring approved returns to either store. Original delivery charges are non-refundable.
  • Start a return: Submit our Online Orders Support form and wait for approval before returning anything.

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