Originally Posted by noisebeam
I picked 41, 43, 47, 49 because with the exception of 49x14 these four chainrings all result in the number of skid patches equal to the number of cog teeth (at least for cogs 12-18).Al
i noticed that; they are all prime. nice chart! i still listed skid patches as a possible criterion because some persons might feel that 17 is a lot more than 14 (or, for the ambidextrous, 34 is even greater than 28).