I don't know anything about continental divide singletrack, but I challenge the notion that it's not rideable. Why else would it exist? Or are these hiking trails? Or (motorized) dirt bike trails? In any case, if you pointed me up a steep, rocky climb and gave me the choice between 29+ and 27+ wheels, I'd take the bigger wheels any time. The increased traction and rollover capability cancel out any weight penalty in my opinion.
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