loading
reading
writing
saving
searching
Shimano Ultegra RX rear derailler - RX800 - 11 speed - $60 (South Pasadena)
QR Code Link to This Post
Works up to a 42t cog and maybe larger, but you will need some adapters.
For most, 42t is plenty.
Has a clutch to keep the derailleur still and keeps the chain from slapping around on bumpy terrain.
Scratches but fully functional with no problems.
Perfect for gravel bikes.