Skid Spots

The top row of the table below is the number of teeth on the chainring. The leftmost column of the table below is the number of teeth on the cog.

Table: Skid Spots


I believe it is easier to access multiple cogs than multiple chainrings. So I recommend having a good sized chainring. If the chainring's teeth count is a prime number, then you'll maximize skid spots to the number of teeth on the cog, i.e. 53, 47, 43, 41, and 37.