Shimano SM-CS50 Outer Stopper Assembly

These stoppers are designed to convert traditional downtube shift bosses into cable housing stops. This is essential when you are upgrading an older frame to modern shifting systems that require continuous housing runs.

These are specifically designed for frames with flat downtube interfaces. They will not fit frames with curved or non-standard downtube bosses, so check your frame's mounting surface before purchasing.

No, the assembly comes as a pair, which is enough to cover both sides of your downtube for a complete installation.

While they are intended for housing stops, they are primarily used to facilitate modern shifting setups. If you are converting to a single-speed, you typically wouldn't need cable stops, but they can be used to clean up the look of the frame if you are removing old shifters.

These are designed to accept standard derailleur cable housing. Ensure your housing ends are properly capped with ferrules for a secure fit within the stopper.