Originally Posted by Bah Humbug

Oh yes, there's a world of difference between a 12-25 and an 11-32, for example. Back in the 10sp days I was a bigger fan of 12-27 than the more common 11-28s because of those gaps. Now in 11sp I'm fine with 11-28,but 11-30 and 11-32 (or even 11-34) are common. What's yours?

That said, there's no one rear cog tooth count that's "right" for flat land, even though 16 and 18are commonly cited as such. It also matters what your front gears are, fitness, surface, wind...