CYCLUS TOOLS special workshop tool with handles for installing/removing SHIMANO 20-tooth cartridge bottom brackets BB-UN 51/71/72, model Z20 32.0. Designed for cartridge bottom brackets with a standard Shimano 20-tooth spline interface (BB-UN 51/71/72).

Made of Kinex-Alu aluminum with thick rubber handles to apply the high tightening torques required for installing and removing cartridge bottom brackets.

Insert the installation tool into the splined housing of the bottom bracket and rotate the spring-loaded insert into the crank arm mounting bolt hole to secure the tool. This allows the bottom bracket to be installed or removed without slipping or damaging the bearing shell splines.

Tip: When installing the bottom bracket cartridge, first ensure that the frame threads are clean and greased. Pay attention to the frame material and the bottom bracket tightening torque values specified by the manufacturers.