[bad mechanic]

Right now my XC bike has a 100mm stem with 15 degree rise. I'm happy with how the bike rides, but I would really like to make it a little easier to get the front end up, especially for a couple small log drops on my local trail. To that end I've been looking at putting a shorter stem on there. I'm considering either a 80x15, 90x15, or maybe a 80x0. I don't know if it matters, but I'm running a XC riser bar.

 

[McGRP01]

5* x 90mm

 

[FBTMILF]

thomson all the way

 

[bad mechanic]

I'm not getting a Thomson. I just need help picking one of those three sizes.

 

[zahgurim]

Fit is pretty personal, we can't really tell you what will work best for you, other than to say, "Go with something shorter/higher to get the front up easier."
Your best bet is to try them all, and go with the one that feels best for you.