limit screw

noun2

1. •
   A screw used to adjust some mechanical limit.
2. •
   A type of screw used in the derailleurs of a bicycle to set the maximum and minimum range of the derailleur's movement.

   • Shift the chain to the inner ring, and then tighten one of the limit screws. If turning that screw moves the front derailleur outward, then it is the low-gear limit screw. — 2024