Pictured are standard commonplace derailers that are held
into place mainly by the wheel's axle nut and will have a
smaller bolt and nut going through the frame to keep them
in place when the wheel's removed.
They're not designed to work on the more upper-end bikes
that have a seperate hook-shaped derailer hanger.
Most are misc.Shimano models but there are other brands also.
Quite an assortment of other bike parts available also.
Inquire by calls only please (no texts) at 886~4483
Generally available from noon until early evening.
do NOT contact me with unsolicited services or offers