Hm. Interesting. Although I was around for the System 10, and I even donated a track bike that had been built with it (the original owner kept the drivetrain parts), I never thought of applying it "full size".

i wonder what the weight penalty is at "full diameter" sizes. You'll have more pins/rollers (which I figure are heavier than just a side plate). Less negative space on teeth?

On the other hand you'd have better wear, quicker chain shifting (although maybe the closer teeth would be harder to shift onto - more ramp action needed), and, of course, fine tuned ratios.

Hm hm hm.

cdr

*Edit* I forgot to add that the higher number of teeth front/back is one reason why pros used huge rings in TTs - 55, 56 was normal. But they'd use a 55x15 in the TT itself, not the 55x12. The 55 helped because a one tooth jump (55x15 to 55x14) had a smaller overall effect on gear than, say, a 53x14 to a 53x13.