788 Reamer: 43.95mm Bike Tool

This 788 reamer is an essential accessory and replacement part for Park Tool head and steerer tube cutting tools. It reams the head tube's inner diameter to 43.95mm, perfectly fitting 'internal' headset cups with an outer diameter of 44.05 - 44.10mm (1-1/8 ZS standard). You can use the 788 along with the 690-XL Facing Cutter and 750 Centering Cone. It's suitable for both upper and lower headtubes that accept ZS44 or EC44 headsets.

Using this 788 bike reamer tool is quite straightforward. First, make sure your head tube is clean and free of debris. Then, use the 788 in combination with the 690 - XL Facing Cutter and 750 Centering Cone as recommended. It's important to work slowly and steadily to achieve an accurate 43.95mm inner diameter for the head tube. When using it on upper or lower headtubes that accept ZS44 or EC44 headsets, double - check the fit. As for maintenance, after each use, clean the tool thoroughly with a soft cloth to remove any metal shavings. Store it in a dry place to prevent rusting. If you notice any signs of wear or damage, replace the tool to ensure optimal performance.