Frankly, I’m kind of surprised that it took almost 2 years since Shimano ‘reinvented‘ (renaming everything below Deore ...

Rear derailleur: “The 12-speed Shimano Deore rear derailleur (RD-M6100-SGS ... The new Alivio M3100 series still comes in a 2×9-speed or 3×9-speed variation with new shifters, derailleurs and ...

Buying a high-quality 10-speed mountain bike derailleur from a decade ago, say, a Shimano Deore XT RD-M786 SGS, doesn't actually cost any more than what you'd spend on eBay buying a Deore XT rear ...

There's also the option to go 1x, when you can use the XPLR version of the rear derailleur to run ... front and even hydraulic brakes. Shimano Sora offers a 9-speed option that's sometimes specced ...