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It is confusing because they’re trying to describe the shape. Which is perhaps a distraction really. I’m not sure I understand ‘negative rise’ in this instance.
I would just measure your current setup (from the bottom of the steerer clamp to bar ends) and see how close they are to these.
All that matters is where your hands will be ... and if that matches your current (or desired) setup.
Hope that makes sense.
Hmmm... bare with me for a second, so the negative rise part equals bar ends swept down? Like putting a pair of risers with upsweep upside down?
It's still a little confusing for me...all I know is that i would usually need a 80 -85 mm stem for a 710mm bar on my Surly KM