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Shimano GRX Di2 RD-RX717 wireless 12-speed rear derailleur with Shadow ES technology. Long-cage SGS design, ultra-stable shifting, 10–51T compatibility, and rugged gravel performance.

Shimano GRX Di2 RD-RX717 wireless 12-speed rear derailleur with Shadow ES technology. Long-cage SGS design, ultra-stable shifting, 10–51T compatibility, and rugged gravel performance.

Shimano

Shimano GRX Di2 RD-RX717 Wireless Rear Mech/Derailleur 12-Speed Shadow

£299.00 £379.99 21% off
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Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!

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With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

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Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

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We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined

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Shop with confidence. If you've ordered the wrong size or you're not happy with a purchase it's not a problem. We want to help you find the right products to get the most out of your cycling. Simply return the item to us within 30 days in unused condition with all the packaging and we'll replace it or refund you. Kindly note that refunds can take up to 14 working days to process. *InvisiFrame kits are non-returnable/non-refundable.

We do not offer free returns because we aim to keep the cost of the product as low as possible. However, if the goods are found to be faulty, damaged or not as described, please contact us to discuss the returns process.

Call us if it's a bike as we can help arrange collection. Tel 01752 849315 or info@certini.co.uk

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Returns Address:

Certini Bicycle Company
10 Kingsmill Road
Tamar View Industrial Estate
Saltash
PL12 6LD

Under the Consumer Rights Act you have a legal right to reject goods that are of unsatisfactory quality, unfit for purpose or not as described, and get a full refund - as long as you do this quickly. This right is limited to 30 days from the date you buy your product.

CHRISTMAS RETURNS

We want to take the hassle out ofChristmasfor you so we have extended ourReturnsperiod during this time. Any products purchased between 1st December 2025 and 24th December 2025 can be returned until 18th January 2026. Please refer to ourreturnspolicy before returning your items.

Shimano GRX Di2 RD-RX717 Wireless Rear Mech/Derailleur 12-Speed Shadow

Brand:Shimano

Code:RDRX717SGSA

Shimano GRX Di2 RD-RX717 Wireless Rear Derailleur 12-Speed Shadow ES SGS Long Cage

The Shimano GRX Di2 RD-RX717 Wireless Rear Derailleur is purpose-built for modern gravel and adventure riding, delivering ultra-precise 12-speed electronic shifting with outstanding durability and chain stability. Designed around Shimano’s latest Shadow ES technology, this long-cage SGS derailleur provides a low-profile, impact-resistant design that excels on rough terrain, bikepacking routes, and cyclocross courses.

Featuring fully wireless Di2 shifting, the RD-RX717 uses an integrated removable battery (BT-DN320, sold separately) housed securely within the derailleur linkage for protection from trail debris and impacts. Shimano’s intelligent crash recovery function absorbs sudden knocks and automatically returns the derailleur to its original position, ensuring uninterrupted performance.

The advanced dual-spring Shadow ES chain stabilisation system increases spring force by 70%, delivering tighter chain wrap, reduced chain slap, and exceptionally quiet operation across mixed terrain. With compatibility for 10–51T wide-range cassettes, this SGS long-cage rear derailleur is ideal for steep climbs, loaded gravel riding, and endurance adventures.

Premium construction details, such as steel pulley cages, 13T solid pulleys, fluorine-coated bushings, and a cold-forged alloy outer link, ensure long-term reliability with virtually zero maintenance. Integrated BLE and ANT connectivity allows seamless pairing with Shimano Di2 systems for customisation and diagnostics.

  • Shimano GRX Di2 wireless rear derailleur for gravel & cyclocross
  • Shadow ES low-profile design with skid plate for maximum clearance
  • 12-speed Di2 electronic shifting with precise, quiet operation
  • SGS long cage compatible with 10–51T wide-range cassettes
  • Dual-spring chain stabilisation reduces chain bounce on rough terrain
  • Integrated removable battery (BT-DN320 sold separately)
  • Crash recovery function for impact protection
  • Zero-maintenance Shadow ES system with no performance degradation
  • BLE & ANT wireless connectivity

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