Lock Ring Tool for Bosch chainring

Tool to tighten and loosen the chainring in Bosch ebike motors. With this key you can change the sprocket when worn or to adjust the gear ratio. Remember that Bosch closing thread going backwards than normal.

Select the needed option:

• Model 50mm: for Bosch Active, Performance and Performance CX lines.
• Model 60mm: for Bosch Classic, Cruise y Speed lines.
• Model 42mm: for the new Active Line, Active Line Plus, Performance Line y Performance Line CX (BDU3xx and BDU4xx series).