Shimano SM-CS50 Outer Stopper Assembly
Best conversion hardware for cyclists upgrading vintage road bike frames.
These essential adapters transform traditional downtube shift bosses into secure cable housing stops. They are the perfect solution for modernizing older frames or adapting setups for contemporary shifting systems.
$19.00
More Downtube Cable Stops options
Who it's for
- Cyclists restoring classic steel frames with modern drivetrain components
- Riders seeking precise gear indexing and easy on-the-go maintenance
- Commuters and long-distance tourers requiring dependable, long-lasting hardware
Who should skip it
- Owners of frames without standard M5 threaded down tube bosses
- Purists prioritizing a strictly period-correct look for their classic bicycles
- Absolute beginners uncomfortable performing basic mechanical adjustments on their own
Performance breakdown
Conversion Versatility
Seamlessly transforms vintage downtube bosses for modern cable housing setups.
Build Integrity
Robust Shimano construction ensures long-term reliability under constant cable tension.
Installation Simplicity
Straightforward bolt-on design makes frame modernization accessible for home mechanics.
Interface Compatibility
Strictly limited to flat downtube bosses, excluding curved or aero frames.
Aesthetic Integration
Low-profile design maintains a clean, factory-finished look on restored frames.
Cable Routing Efficiency
Provides a secure, friction-free stop for precise shifting performance.
Key Specs
Part Type
Cable Stop
Mounting Type
Downtube
Quantity per Pack
2
Weight
22.68 grams
Compatibility
Flat downtube shift bosses
Know before you buy
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