Rear derailleur – Shimano RD-U6070 GS Di2 CUES Linkglide

137,05 
1 x 11 speed, direct mount, medium cage, max 50T, capacity 39T, compatible only with Linkglide drivetrain systems

Rear derailleur – Shimano RD-RX825 GRX Di2

255,19 
2 x 12 gears, frame mounted, short leg, max 36T, total capacity 40T, Shadow RD+ technology

Rear derailleur – Shimano RD-U2000 ESSA

29,13 
1 x 8 speed, max 45T, min 11T, compatible with regular 8 speed gear shifters and chains, compatible with CS-HG400-8 11-45T cassette