| one dimension relates to the Piston size of the Mastercylinder and the other the distance between the pivot and the span adjuster which pushes the piston.
Changing from a 16 to a 18 lever increases the distance betwwen Pivot and adjuster, so for the same braking effect you need less effort of for the same effort you get a greater braking effect.
16 X 16 is usually recomended for Single Disc setup or as a clutch master cylinder
Not sure what the one is on my DD bike is its one of the folding ones off ebay that cost about £15 from Taiwan
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