Handlebar Sweep vs Stem Length- Mtbr.com
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  1. #1
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    Handlebar Sweep vs Stem Length

    Does the Sweep of the handlebar change the length of the stem?

    The measurment from the yellow rod to the bar is @ 3.5mm.

    The length of the stem is 40mm, do you minus the sweep of 3.5mm to get 36.5mm?
    Attached Thumbnails Attached Thumbnails Handlebar Sweep vs Stem Length-20200604_162248.jpg  

    2019 Commencal 29 Meta AM.

  2. #2
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    Yes. The relationship that matters, is the distance from the centre of the steerer tube, to the centre line of the hand grips/position. How you get there is basically irrelevant.

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  4. #4
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    The stem length is the stem length. You make it whatever length you need to make it in order to get the proper fit. Obviously, the length of the stem, in conjunction with the width, rise AND sweep of the bars, will be factors in setting up your bike's fit.

    How you get there is kind of irrelevant. Sort of. Obviously reach matters, but at a certain point you buy a frame and then dial in the actual fit with stem, spacers, and bars.
    Death from Below.

  5. #5
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    yes, if you're looking from the top down and only considering the horizontal plane, bar sweep can be subtracted from stem length (at the center line of where you grip, more or less)

    but bar rise is different than stem rise (depending on how you rotate the bars) so they aren't exactly equivalent in practice.

  6. #6
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    Quote Originally Posted by dougiet View Post
    Does the Sweep of the handlebar change the length of the stem?

    The measurment from the yellow rod to the bar is @ 3.5mm.

    The length of the stem is 40mm, do you minus the sweep of 3.5mm to get 36.5mm?
    O.P. Not everybody can get 2 to 3 different size bars and stems to try on for size on their bike. Are there charts that show numerical values in millimeters to help calculate some of the bar sweeps? Like, be able to read '3.5mm back of the stem' so you can get a better fit.
    This handlebar, for example, has information but omits to the fact that you have to minus 3.5mm from the length of the stem. ..JUST SAYING..

    RIDE ALPHA 780 MM WIDTH 30 MM RISE HANDLEBAR BLACK
    - 5 Up Sweep

    - 7 Back Sweep

    - 30mm / 0,75" Rise
    2019 Commencal 29 Meta AM.

  7. #7
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    The problem is that different bars have different shapes. Most bars have a straight unswept portion in the center that's 150-200mm wide and then a straight-ish section on both sides that angles back at the sweep angle. So the sweep back distance is around:
    0.5 * (Bar Width - Unswept Portion Width) * sin(sweep angle).

    Switching between bars with different sweep angles I've used this formula to get a good guess on how much I needed to change the stem length to compensate. Because of variation in bar shape there's always some error in this, but it's been close enough for me.

  8. #8
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    To add to the confusion, my bars with 20 degree sweep go forward first before bending backwards so that they don't require longer stems.
    Ripley LS v3
    OG Ripley v2 handed down to son

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