Originally Posted by NNNN
the only thing from the other thread that is important:
you just reduce the fraction of the chainring over the cog, and the denominator is the number of skid patches. If that number is odd, and you happen to skid or skip both ways (right foot forward, left foot back, and the other way around) you double the number of skid patches. There's a big difference between 34 or 38 patches vs 1 or 2.
The skid patch theorem says it's the # of chainring teeth whose oddness or eveness makes that difference. Is that wrong?