Park Tool 788 Reamer

This reamer is specifically designed as a replacement part for Park Tool's head and steerer tube cutting systems. However, you should verify that your specific handle or driver assembly is compatible with this 43.95mm cutter size before purchasing.

The 43.95mm diameter is precision-engineered for 1-1/8" Zero Stack (ZS) headset standards. It ensures the head tube is perfectly sized to allow for a smooth, interference-free press fit of the headset cups.

Yes, using a high-quality cutting fluid is essential. It helps keep the tool cool, prevents the metal from galling, and ensures a clean, accurate cut that extends the life of the reamer's edges.

No, this reamer is intended for metal head tubes, such as steel or aluminum. Attempting to use this on a carbon fiber frame will damage the frame and likely ruin the tool.

You should replace your reamer if you notice the cut quality degrading, such as rough edges, chatter marks, or if the tool requires significantly more force to pass through the head tube. Dull cutters can lead to inaccurate sizing and potential damage to the frame.