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Then i find your question baffling...do you not consider clearance to be important?
I would have thought somebody who does lots of mountain biking could have figured out how a bike with clearance as small as a mouses cock would struggle in scottish mud.

I do consider clearance to be important, but not every where has the peaty shitty mud that clags up everything it touches, these places still have rain and slippy surfaces that require a decent tread.
I didn't read your original comment as being "Scottish" specific (reading fail on my part).