Originally Posted by
Koyote
One other significant difference is terrain -- e.g., a 20% grade on smooth pavement might be easier than a 10% grade on an MTB or gravel route which may include potholes, rocks, tree roots, and mud.
Another difference would be elevation: I've done some big climbing events at elevations as high as >14,000 feet; the thin air takes a toll.
Any grade at 14,000 feet, would all have to be downhill. The only thing that would need factored in at that point is what shape are the brakes in
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