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Item # 789

/ Tools / Frame & Fork

55.95mm Head Tube Reamer for 1-1/2" ZS Standard

Reams head tube I.D. to 55.95mm to accept “internal” headset cups with 56.00–56.10mm O.D. (1-1/2 ZS standard). Used with #690-XXL Facing Cutter and #750 Centering Cone Adaptor. Designed for use with the HTR-1 or HTR-1B Headtube Reamer and Facer.

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789 Features

NOTE: For sharpening services of cutting tools see Park Tool Sharpening Services. Always use cutting fluid such as Park Tool CF-2 when machining.

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

Compatible Products


Head Tube Reaming and Facing Set


Head Tube Reaming and Facing Set


Reamer/Facer Handle Set

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