Originally Posted by daihard

I'm not experienced enough to know, but in my case, I definitely like my 80mm stem. The bike came with a 6-degree 90mm one, which made my arms stretch out quite a bit. The LBS swapped it out with a 7-degree 80mm stem, and I'm pretty comfortable with it. I've also watched a YouTube video by Performance Bicycles that says your stem is the right size if your front hub is hidden by the handlebar from your riding position. That's the case with my stem.

I believe the stiff neck comes from the fact that I'm not used to the road bike position. If not, I will hopefully know at the fitting session tomorrow.