Details:

• Material tool: Carbon steel
• Material tube: Tool steel
• Use: First remove the rear derailleur and insert the tool into the frame. The tool is adjusted so that it touches the rim only slightly. This distance must be the same at different points on the rim. If it is not, it can be recentered with the alignment tool.

Note: When performing repair work, first the rear wheel must be centered because an aligned rear wheel is the basis for the adjustment of the derailleur hanger.