Originally Posted by

**JimiMimni**
One of my math major friends in college worked out a formula for adjusting stem length to keep the same total extension fit different width bars. He used it primarily for MTB bars, but it should be just as applicable to road bars as well.

For most proportions, the stem length goes up by 1cm as the bars get 2cm narrower, and vice versa.

That's an interesting thing that I have definitely left out of my calculations/estimations during fitting. Thanks!