Is the second decimal important in the ring/cog ratio? The ring of my single speed is starting to wear out now that I'm approaching the 10k km and I'm planning to do an upgrade. 

Most of the crank sets that I find interesting only come in 48–51 teeth.

I'm currently riding a 44 teeth with 16 teeth rear cog, that makes 44/16 = 2.75. I really like the setup as it is enough to get away with most hills near my city and I still can ride quite fast.

Will I notice any difference if I go with any of the following?


48t and 17t = 2.82 (+0.07)
50t and 18t = 2.77 (+0.02)
49t and 18t = 2.72 (-0.03)
48 x 17 = 2.82: 2.7% difference

50 x 18 = 2.78: 1.0% difference

49 x 18 = 2.72: -1.0% difference

I guess you might notice the almost 3% difference of the 48 x 17, but not the +/- 1%.