That's a tough question. I've heard the "10mm" rule mentioned before, but there's probably no real formula because the clearance issues can be aggravated by the shape of the area where potential contact can occur. For example a very smooth stay shape with a small potential contact point would likely be less prone to issues than one where the potential contact spot is larger and very sharp edged. Two guys at our shop are running Neo's front/rear in '07 Spec Epics. It's darned tight back there, but neither has had an issue. Now...all bets are off if serious mud is involved...especially that aggravating packing type of mud. The rear tire is much more likely to go through the stays even if a rock or such momentarily tries to jam in that space since rider weight at the rear tends to exert more pressure to keep the wheel rolling...usually. One thing to consider, however, is the possibility of frame or linkage damage depending on the design and stay material. There are lots of potential variables in your question.
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