The RPM difference between the two sprockets will change depending on where in the rev range you compare. At say 2krpm with the 17, the 18 will only be I dunno 100 rpm different, whereas at like 4krpm with the 17t, the 18t would be more signifficantly less, like 500. See what I mean? That being said, I do notice that I have to ride the clutch starting on a hill 2-up a little, but other than that it's all good.
