Adding two teeth on any sprocket is going to move the axle by the exact same amount. Don't make me start writing math equations!Hmmm, that's a bummer. Most Superbikes and SSs tolerate adding two teeth to rear sprocket. Perhaps the issue is more of the big size of the smaller monsters' larger rear sprockets! In that going from 41 to 43 is much different than 37 to 39? ???