Originally Posted by
Dr1Gonzo
And no need for a longer chain with a 18t? ie moving from 46/16 to 46/18.
Each tooth increased or decreased will force you to move your axle 1/8 inch. So swapping from 16 to 18 and vice versa will require you to re position the wheel 1/4 inch (6.35mm) forward or rearward in the dropouts.
You'll need to look at your current set up to see if that will work, based on where your axle sits now. Also check tire/seat tube clearance.