So I just got my new frame and I love it,

However, I feel like I am locking my elbow's out and finding my neck start to hurt around 30k's into a ride.

I currently run a 120mm stem with a 6 rise. I was thinking about getting a 100mm with a 7 rise.

My question is, is this to small, a decent, or to drastic change? I know how much 20mm can make, but I have never messed with the rise of a stem before.

Thanks for the assistance.

Use this tool when playing around with reach and rise.
2cm will be a noticeable difference. 1 degree will not.

Wow,

That is an amazing tool! Thank you so much!

The diff between 6 and 7 degree rise for a 100mm stem is less then 2 mm.

Here's a web stem calculator. https://alex.phred.org/stemchart/Default.aspx

This one is good too, but seems not to be working: https://www.brightspoke.com/t/bike-stem-calculator.html

One thing I am not understanding is why is it saying the blue stem (the stem i am looking at with more rise) is saying that it is 7mm lower, wouldn't that be considered 7mm higher?

I get it now, I am a dummy... I wasn't playing connect the dots correctly.

However now my question is, because its 7mm lower, should that impact my neck pain? I am sure the shorter stem will help with elbows, but is that going to give a noticeable enough rise for my neck to straighten out?

I like it too. Even though things like this mean I'm slowly forgetting all my geometry formulas.

Your torso may be more upright if your arms are not reaching as far forward.
A good way to test this is to bring your hands 2cm back from the hoods. A better way is to try out different stems, or one with an adjustable rise. Best is to go in for a professional fitting.

I will try that tonight, hopefully its enough of an adjustment. Thanks for the tip.