How does stem rise affect bike fit?

Question

In lean terms, what does an increased rise of a bike stem mean and how does this increase affect my riding position?

Answer 1

The rise of a bike stem is defined as the angle at which the stem extension tube leaves the steerer clamp stack which ultimately determines how high the handlebar is. In this case, the presence of positive rise will tilt the weight away from the hands whereas negative rise will propel the weight onto the hands which has an impact on both comfort and the responsiveness of the steering. The measurements of the effective length of the stem are widening as the angle of the rise is increasing since the angle will bring the extension closer to the perpendicularly flat steering wheel. The measure of the perceived angle of the rise can also be varied in order to facilitate the rider’s position into the desired one whether for wind penetration or comfort.

Comments

I am capable of a reasonably aggressive position on a bike. I often will run an aggressive negative rise stem with some spacers below rather than neutral rise slammed. Same bar position but easier resell as a potential new owner has greater adjustment options. Additionally it’s not really about the stem, it’s the position of hand poison/controls in space.  The bar plays an equal role in this on a road bike.

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I recently hadba bikefit where the stem was changed from 100mm -6° to 120mm +17°. Now I'm way more comfortable on the bike, but I hate the look of it.

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Thanks you. Great content. You mentioned the reach is shorter when angle is higher. That makes sense. If I have a 90mm stem, one with 6 degree and one with 12 degree, the reach would be shorter with the 12 degree. I think I got that (hopefully). What would happen if I have two stems. One with 90mm and 6 degree and the other 110mm with 12 degree. On the same frame, would the reach still be shorter due to the 12 degree rise even though the length increased 20mm? Just want to check! Basic geometry says: Vertical rise = stem length * sin(angle) = 90mm * sin(6°) ≈ 9.5mm and Vertical rise = stem length * sin(angle) = 110mm * sin(12°) ≈ 23.0mm. The difference in vertical rise between the two stems is approximately: 23.0mm - 9.5mm = 13.5mm. So, by switching to a 110mm stem with a 12-degree angle, I will effectively raise my handlebars by approximately 13.5mm, reducing my lean and back angle. Does this make sense or am I way off? My forks are cut so no play in stack height and trying to reduce the reach - slightly so thinking this combo may work. Would love to hear your feedback. Thanks so much for great content. Saving this one to back to from time to time.

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I was riding upright position and yes I did get fitted for my body.  never felt that kind of pain in my vertebrate. So I flip the stem had better control more comfortable.So upright position is not correct all the time .

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Awesome content. By the way, what is your bike frame size, your height and your bike stem length? Thanks

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The cosine of 8 degrees is 0.99. Your stem would have to be 500 mm long for you to have a difference in length of 5 mm when you raise the stem by 8 degrees. You need to run these contents by a technical editor