Yeah but going from 14 down to 9, you're gonna need some of the gears from each of the two sets of 7. Ah forget it...this is getting too confusing to describe.zedro said:huh? they're all usefull, it would be spaced like a road cassette (actually probably with a near geometric progression of 13%-14%). Remember their 14 speeds cover a 27 speed drivetrain; it's chainwheel/cog systems that have redundant ratios.