- Functionality: This tool is essential for calibrating the tail hook of your bicycle frame, effectively resolving various transmission issues, particularly in aligning the rear derailleur of your bike. - Precision Measurement: Designed to ensure accurate horizontal height adjustments for the manual transmission on road bicycles, this tool guarantees symmetrical positioning on both sides. Please verify that the front fork cover size of your bike is compatible with the tool's adapter before use. - Durable Construction: Made from premium aluminum alloy, the tool features an anodized finish for enhanced durability. The stainless steel measuring rod displays a clear scale for easy reading, and the tool allows for 360-degree rotation correction with CNC precision threads for a tight fit. - Improved Performance: Utilizing this tool can significantly reduce abnormal noises from your bike's rear transmission system. Following a few simple corrective steps with this tool can lead to quieter operation and improved balance in manual transmissions on both sides of the handlebars. - Practical Applications: 1. Ideal for bike enthusiasts who frequently adjust their rear derailleur for optimal performance. 2. Perfect for professional bike mechanics needing reliable calibration for customer bikes. 3. Useful for cyclists looking to enhance their riding experience by eliminating transmission noise and ensuring smooth gear shifts. This tool combines functionality, compatibility, and performance to enhance your cycling experience while maintaining a professional and trustworthy quality.