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Having ridden many bikes of many different architectures I can confirm there is plenty of substance to the hype of rearward axle path bikes. I hear what you're saying, 30 - 50 mm of horizontal rear center growth on bikes with 160 to 200 mm travel seems really small, especially when plotted using a CAD package. How can that make such a difference? I'm not sure I can explain the physics of what's going on, but my understanding is that if the axle path is rearward (rather than forward on most bikes) that the effective angle of impact with an object lowers, thus requiring less horizontal force to motivate the rear wheel up and over the object. Regardless of the exact physics at play I can confirm every high single pivot bike I've ridden has had incredible square bump compliance.
The Anti-dote Dark Matter looks like a really cool bike! But the axle path is less rearward than you're saying. Their website shows a max. rear center growth of 22 mm and 14 mm at bottom out. That's less rearward than the high single pivot bikes out there at the moment. I don't know what the rear center growth on the Shore is, but it'd be neat to know how it compares and see how it rides in comparison to both high single pivot, and standard 4-bar bikes.
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