Park Tool 738 Headset Reamer

No, this specific reamer is designed exclusively for 1-1/2 inch head tubes. It will not work for standard 1-1/8 inch or tapered head tubes unless you are specifically preparing the 1-1/2 inch section.

Yes, the 738 is a cutter head and requires a compatible Park Tool handle or reaming assembly to operate. It is designed to be used as part of a complete headset reaming system.

While it is built to the high standards of professional workshops, it is a great tool for home mechanics who are serious about frame preparation. However, because it removes metal, it requires a steady hand and proper technique to avoid over-cutting.

Reaming ensures the head tube is perfectly round and the internal diameter is consistent. This prevents headset cups from binding, ensures they sit flush, and significantly extends the life of your bearings by eliminating uneven stress.

No, this tool is intended for metal bicycle frames. Using a steel reamer on a carbon fiber frame will cause catastrophic damage to the material.