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@hippy
True, but most people are using it as a simple comparison of how hard their gearing is and 27" is typically used for this comparison, regardless of what wheels/tyres people are using (it is usually 700c x 23 but I guess any 20mm users or 27" peeps can factor that in).
Sheldon has his "gain ratio" which would be even more accurate for comparing how "hard" one person's gear is over another. The gain ratio value also takes into account crank length (longer cranks = more mechanical advantage).