Park Tool 789 55.95 reamer

Reams the head tube I.D. to 55.95 mm to accommodate "internal" headset cups with an outer diameter of 56.00-56.10 mm (1-1/2 ZS standard). Used with the facing cutter #690-XXL and the centering cone adapter #750. For use with the HTR-1 or HTR-1B head tube reamer and facer.

FEATURES:

• SHIS terminology: The 789 is used for upper and lower head tubes to accommodate the ZS56 or EC56 headsets.