Originally Posted by LesterOfPuppets

A stock 1990 Stumpjumper stem will likely be too long and too low for use with drops, IMO. Seems like they were shipping those with 120-150mm stems.

If you were comfortable on the bike with flat bar, you'll probably want to move the clamp area of the stem 30-70mm aft and 50mm up to get good use of the drops.

Dirt drop stems do well at getting drop bars in a usable location, but you can find stubby, high-rise quill stems pretty cheaply. Well, assuming you have bike shops with junk drawers around like I do.

Tons of short/high stems from back in the day can be had for $0-5



That stem might even be a little too short/high if your Stumpy had a really long/low stem like this: