The Park Tool 789 55.95mm Reamer, click to enlarge

Item # 789

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55.95 mm Reamer

The 789 is used in conjunction with the Park Tool HTR-1 Head Tube Reaming and Facing Set to ream head tubes that use the 1.5" internal cup headset standard.

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789 Features

  • Sized for 1.5" internal cup headsets
  • SHIS: sized for ZS56 and EC56 head tubes
  • 55.95 mm outer diameter
  • Requires use of the 750.2 Centering Cone Adaptor

NOTE: Always use cutting fluid such as Park Tool CF-2 when machining.

Repair & Service

Compatible Products


Head Tube Reaming and Facing Set


Head Tube Reaming and Facing Set


Head Tube Reaming and Facing Handle Set



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