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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.


  • Reams to an internal diameter of 55.95mm
  • Prepares a headtube to accept internal headset cups with 56 and 56.1mm outer diameter (1.5 ZS Standard)
  • Requires use of the HTR-1/HTR-1B Head Tube Reamer and Facer Set
  • Used with the Park Tools #690-XXL Facing Cutter and #750 Centering Cone Adaptor
  • Always use a cutting fluid such as Park Tool CF-2 when machining.


  • Brand: Park Tool
Weight 1 lbs