I have a mid-1990s Specialized Rockhopper. I've trashed the flat bars that were on it previously and I want to install drop bars, but to make that comfortable for me I'll want a shorter and higher stem.
So I need to purchase:
- A short riser stem that will fit the mountain bike's nonthreaded headset correctly
- A set of drop handlebars that will fit the stem's clamp
but I am lost in measurement purgatory. I've measured the diameter of the tube to which the stem will clamp (with a measuring tape): outside is 28mm and inside is ~25mm. Ok, great! Let's go check out some stems...
So the last measurement (80/90/100/110 mm etc) is probably the length of the stem, and the degree is the amount of its rise. What on earth are all of the other numbers? What types of stems usually fit this kind of bike? Are there drop handlebars that usually fit this kind of stem, or do those tend to be a different diameter (because they usually go on road bikes)?
What on earth are the measurements I need to be shopping with?