"First off, there's the new GRX Di2 rear derailleur. With the same exact tech we saw for XTR, XT, Deore & this summer's RX825 GRX, the new RX717 derailleur features full compatibility across the entire wireless Di2 ecosystem. It gets the same low-profile design, impact recovery, and the dual-spring 'not a clutch' Slim Stabilizer for reliable chain retention. Plus, it gets solid pulleys that you won't have to dig grit out of to keep your drivetrain cleaner."
"The one real distinguishing feature from the other new wireless Di2 derailleurs is the long SGS steel cage, bringing the weight of the new $435 / 380€ GRX Di2 RX717 rear derailleur to 518g, complete with its battery. That's actually just 1g over Shimano's claimed weight, which is without the $55 / 45€ battery. Can electronic drivetrain makers please stop quoting component pricing & weights without the battery,"
Shimano's GRX Di2 RX710-series offers a lower-cost wireless 1x gravel groupset that uses a slightly heavier Di2 rear derailleur and simplified shift-and-brake controls. The RX717 rear derailleur uses the same tech as XTR, XT, Deore and RX825, including low-profile design, impact recovery, a dual-spring Slim Stabilizer, and solid pulleys, and features a long SGS steel cage weighing 518 g with its battery. The derailleur is priced at $435/380€, with a separate battery costing $55/45€. The groupset supports mix-and-match component combinations and full compatibility across the wireless Di2 ecosystem.
Read at Bikerumor
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