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 ...

but now that we've been given a taste of Shimano's intriguing Shadow Plus rear derailleur design, we can't help but eagerly await its addition to Deore XT for more silent running. In bigger news ...

Rear derailleur: “The 12-speed Shimano Deore rear derailleur (RD-M6100-SGS) enables precise and quick shifting within the 10-51T range. 13-tooth pulley wheels and Shimano Shadow RD+ technology reduces ...

Deore XT Dyna-Sys Cassette (CS-M771-10): The ... Shadow rear mech (RD-M663): Available in an SGS (long cage) version only, the rear derailleur costs £49.99. Rapidfire shifters (SL-M660-10R ...