Derailleurs are used to move the chain from one sprocket / cog to another
Shimano RD-R8050 Ultegra Di2 11-speed rear derailleur E-tube, GS cage
Shimano RD-R8050 Ultegra Di2 11-speed rear derailleur E-tube, SS cage
SRAM NX Eagle 12 speed rear derailleur - black
Shimano Altus front derailleur FD-M313 Altus hybrid front derailleur, conventional swing, dual-pull, multi fit
Shimano RD-M8100 XT 12-speed rear derailleur, Shadow+ SGS single
Shimano RD-M310 Altus rear derailleur,SGS, black
Shimano RD-T4000 Alivio 9-speed rear derailleur, SGS, top normal, silver
Shimano Altus front derailleur FD-M371 Altus 9-speed front derailleur, conventional swing, dual-pull, multi fit
Shimano FD-M370 Altus 9-speed front derailleur, top swing, dual-pull For 9 speed drivetrains
SRAM X5 8 - 9 speed Rear derailleur, medium cage in silver
SRAM 12 speed GX Eagle rear derailleur Max 52T
Shimano RD-4700 Tiagra 10-speed rear derailleur, GS