Aside from all the teh Interm=nets drama that inevitably develops in threads like this, sometimes ideas can be bounced around on message boards...
What would be even cooler is "Decimal" tires, lol.
If a 20 X 1.75 rear tire is the most popular, make it in varying diameters, like 19.3", 19.5", 19.75", 20", or something like that. I a not sure how to change tire profile and tire width independently, but is would be pretty convenient to "drop or add a tooth" (the equivelent in development) by a simple rear tire change.
If a 44/16 w/ a 19.75" inflated diameter = 54.3, A simple tire change w/ a different diameter can change things quite a bit. 44/16 w/ 19.5" inflated diameter = 53.6. That's w/ only a 1/4" difference in diameter (only 1/8" in tread depth).
If you keep the diameter fixed, like 19.75", and change gears: (44/16)19.75 = 54.3; (43/16) 19.75 = 53.1
Now if you combine gears, decimal gears, and tires, You now have the ultimate set of options for even the most OCD pit parents out there. (IMG:style_emoticons/default/biggrin.gif
) No need for a decimal cog.