Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: What is the actual difference in the stack height of the avenir stem vs other stems?
Document: This is awesome for my hybrid bike.I'm very tall, and this put me more upright.It's strong, easy to install, and lighter than one of my carbon stems.Expect your spacers to need adjusting, as this has a pretty big stack height.Also, comes with spacers so you can use 2 different handlebar thicknesses.
Be sure to check the stack height of this stem, it was much taller than my old one which meant I had to remove some of my stem spacers and kindof defeated its effectiveness in raising my handlebars. Also one of the handlebar clamping bolts broke when I was tightening the stem...
I was missing one of the shims when I received this, but I called support at Avenir and they replaced it with out hassle. It gives me a little more height on the bar and me in a better position for my lower back. I'd probably like something with more rise or even adjustable.
At any rate, the difference is only very slight.Update: I did buy the 120mm stem, which made a big difference. And just for your information, the 80mm stem weighs 146 grams and the 120mm weighs 165 grams. This is considerably lighter than the adjustable alternatives and it has a nice solid, no-creek angle.
This is a strong stem. I bought the 80mm length and it served my purpose perfectly. I added a 3&#34; riser and brought the handle bars up about 41/2&#34; while bringing it in closer about 2&#34;. This was the result I was looking for. While keeping the original handle bars, it is hard to notice any difference.
This made all the difference for my wife. She needed a more upright posture to take pressure off of her wrists. This moved the handle bars up almost 2" and back toward her the same. I had previous installed a stem extensionDelta Alloy Bicycle Stem Raiserbut this provided the extra that she needed. It appears to be well made and I don't have to be concerned about an adjustable version slipping.
This stem is well made, looks and works fine. I bought the 80mm, which brought my road bike bars up and back enough to make a significant difference in my riding position. I only wish now I would have gotten a longer one (100-120mm). My bad, but the 80mm still helps my old back a lot!Also, the stem fit perfect, although I had to remove 1 spacer. That didn't seem to diminish the effectiveness of the stem.
The Avenir 40 degree riser stem improved my riding comfort and allowed me greater choices on riding positions. Now I can go down in drops with the ability to still look up and see the road. I'm 6'5" and needed some help over the stock stem on my Cannondale Synapse 7.
After a shoulder injury and back surgery I just could not extend myself on my bike without a night of pain after my ride. I went to several bike shops who insisted that I could not increase the height of my handlebars without "ruining" the integrity of my Specialized S-Works. What snobs!So I found this little gem on Amazon and quickly changed out my stem (never have done this before).
At the end you will not obtain the rise you would assume if the mount were to start from the same point. I end with my handle bar raised about one inch from the purchased 100mm stem from Avenir. My original stem was 90mm. If you want a higher raise you may consider the longer options (that is if you can extend the reach a bit more from your current position). Other than that the stem is solid and easy to install
Answer: yes