Shimano
Shimano GRX Di2 RD-RX817 Rear Derailleur 42T Max (for 1x11-speed)
Shimano GRX Di2 RD-RX817 Rear Derailleur 42T Max (for 1x11-speed)
Low stock
Pickup available at Rouleur Cycles - 41 Selwyn Street, Onehunga
Usually ready in 2-4 days
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Warranty Protection – All bikes backed by manufacturer warranties.
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Easy Returns – Hassle‑free returns on unused gear.
SHIMANO GRX - DI2 - Rear Derailleur - SHIMANO SHADOW RD+ - 42T max low sprocket - 11-speed
With an integrated chain stabilizer mechanism, the SHIMANO GRX derailleur provides a quieter experience and shifting security and precision on mixed terrain. For rides on smooth surfaces, the derailleur features and ON/OFF switch for the chain tensioner. The RD-RX817 DI2 version offers the digital precision of SHIMANO electronic shifting and synchronized shifting. and is compatible with mtb cassettes with a 42T low sprocket max.
FEATURES
- Silent and uninterrupted rear shifting on rough terrain
- Adjustable chain stabilizer prevents chain slapping and drops
- SHIMANO SHADOW RD+
- Adjustable chain stabilizer prevents chain slapping and drops
- Smooth and reliable mixed surface shifting
- Switch stabilizer ON/OFF to match the terrain
- Gravel-tuned clutch tension
- Compatible with current road DUAL CONTROL LEVER
- Top sprocket: Max. 11T/Min. 11T
- Low sprocket: Max. 42T/Min. 40T
- Total capacity: 31T
PRODUCT SPECIFICATIONS
MODEL NO | RD-RX817 |
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SERIES | GRX DI2 |
Color | Series color |
Average weight | 318 |
Rear speeds | 11 |
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Top-normal spring type|SHIMANO SHADOW RD+ | ✔ |
Mount|Direct attachment (conventional) | ✔ |
Mount|Direct mount | ✔ |
Total capacity | 31T |
Low sprocket|Max. | 42T |
Low sprocket|Min. | 40T |
Top sprocket|Max. | 11T |
Top sprocket|Min. | 11T |
Fluoric coated link bushings | 4 |
Pulley|Guide pulley bearing | Sealed bearing |
Pulley|Tension pulley bearing | Sealed bearing |
Pulley|Teeth | 11T |
B-axle|Hollow axle | ✔ |
Di2 connectivity wired|Di2 shifting | ✔ |
Firmware update by E-TUBE PROJECT | ✔ |
SD50 port (pcs) | 1 |
SD300 port (pcs) | 0 |
SD50 connector (pcs) | 0 |
SD300 connector (pcs) | 0 |
Shipping
Shipping
Click & Collect – Free
Order online & collect at our Onehunga store.
NZ Shipping Costs
- General Items: $8/item
- Bikes & Frames: $100 (North Island) / $120 (South Island)
- Large/Bulky Items: $30 (North Island) / $60 (South Island)
- Helmets: $20 (North Island) / $25 (South Island)
Rural: Extra fee applies — select “Rural Delivery” at checkout.
International Orders – Contact info@rouleurcycles.co.nz for a quote.
Bike Shipping
- Fully assembled, tuned & safety‑checked before dispatch.
- Carefully boxed (minimal reassembly required).
- Recommend mechanic check before first ride.
Timeframes
- General: 3–5 working days (+1–2 for rural)
- Bikes: 5–7 working days (up to 10 remote) + prep time for build/boxing
- Delays may occur during holidays or courier disruptions.
Tracking & Issues
- Tracking emailed once dispatched.
- Contact the courier first for delays. Need help? Email or call us.
- Report damaged/lost parcels within 3 days.
No PO Boxes – Physical addresses only.
Why Buy From Rouleur?
Why Buy From Rouleur?
Trusted NZ Bike Experts – Locally owned & operated with years of experience helping Kiwi riders get the most out of their bikes.
Custom Builds & Personal Fitting – From road to e‑bikes, we tailor every build to your riding style and goals.
Fast, Reliable Shipping – In‑store stock ships next business day. Supplier stock delivered in as little as 3–5 days.
After‑Sales Support That Rides With You – From servicing to upgrades, our workshop team is here for the long haul.