DESCRIPTION
The Shimano GRX RX820 12-speed rear derailleur is designed for gravel use with 2x drivetrains and a wide-range road bike cassette. It has quiet, reliable shifting and excellent chain security. RD-RX820 is compatible with 34 and 36 teeth on the largest cassette sprocket. It also features Shadow Plus technology, an integrated chain stabiliser, which prevents the chain from slapping on rough surfaces and thus counteracts chain drop. The function can also be switched off when you are riding on smoother roads or when you want to remove the wheel.
Features
Mechanical rear derailleur for gravel bikes with 2x12-speed setup
Safe and quiet shifting on mixed surfaces
Smooth and reliable gear changes
Adjustable chain stabilisation prevents chain drop
Stabiliser with on/off switch to adapt to the terrain and for easy wheel removal
Flat design prevents getting stuck on obstacles
Painted cage plates
Derailleur Pulleys: 13 tooth (bottom, tension pulley), 11 tooth (top, idler pulley)
Derailleur pulley bearings
Weight: 270g
Compatibility:
Shift/Brake Lever: ST-RX820, ST-RX610, ST-R7120
Cassette: CS-R8101-12 (11-34 only), CS-R7101-12, CS-HG710-12
Chain: CN-M8100, CN-M9100, CN-M7100, CN-M6100
PLU: 74134
SIZE INFORMATION
SHIPPING & DELIVERY
Free Shipping
We offer free shipping on orders over $99 NZD*. Orders under this threshold incur a flat rate of $7.20**
*Excludes large or bulky items, which are charged between $25.00 and $100.00, depending on size, weight, and delivery location. Shipping is calculated at checkout.
**Rural delivery surcharge: An additional $6.00 is applied to rural addresses.
Click & Collect
Prefer to pick up your order? Select Click & Collect at checkout and collect from any Pushbikes store. Note: Some products are drop-shipped from our suppliers and may not be ready for immediate collection. We'll notify you when your order is ready.
Delivery Time Frames
In-Stock Items:
Orders for items in stock at our store are dispatched within 1–2 business days (weekdays) of payment. Orders placed after 3 pm will be processed the following business day. Please allow an additional 2 days for rural delivery.
From Supplier
Items shipped directly from our suppliers are usually dispatched within 2–4 business days. Some may take up to 8 business days, depending on the supplier. Estimated delivery times are shown on each product page. Rural deliveries may take an extra 2 days.
Tracking Information
You'll receive a tracking number by email as soon as your order has been dispatched. If you haven’t received tracking details within your expected delivery window, please contact us to confirm.
Shipping Bikes
- Giant, LIV, and Norco bikes are not eligible for shipping due to brand warranty and dealer policies. These must be collected in-store, fully assembled.
- Electric bikes cannot be shipped due to Dangerous Goods restrictions (lithium batteries). These are available for Click & Collect only.
- Other bikes can be shipped with the following rates:
- Kids bikes: $25.00
- Standard bikes: $75.00
Shipping rates are automatically calculated at checkout. If your bike falls outside this standard pricing (e.g., large-size mountain bikes or freight to remote areas), we may adjust the shipping cost. If you're unsure, feel free to contact us before ordering.
Processing of bikes can take up to 7 days if they are needing to be shipped from our suppliers.
Returns and Warranty
For information about returning a product or submitting a warranty claim, please see our Returns and Warranty Policy here.
Questions
If you're unsure about shipping rates or have any questions, get in touch with us with any questions.