Stem Preparation

Why

Threadless headset systems require a nice sqare face to push against for proper function. This is important for well engineered systems that use the Dia-Compe patent, but absolutely critical if using a poorly designed Chris King headset.

Rarely is a cast or fabricated stem faced with any usable precision. The price point just doesn't justify it. You must do this yourself. Machined stems rarely require this treatement.

How

A simple madrel is made to fit a 1" collet and the 1.125" stem. Steel is a good material since when spinning on the lathe the stem will create an unbalanced load.

I prefre to do all work with a collet if I can. I prefer the speed of set-up and the precision.




Very carefully spin the stem on the lathe. Take as little metal off as needed to get a nice face.




Always bag and lable specially made tools. Years later the tool will be clean, in good shape, and clearly marked.