“ Took a look down a westbound road,
right away I made my choice
Headed out to my big two-wheeler,
I was tired of my own voice
Took a bead on the northern plains
and just rolled that power on...”
Bob Seger
Roll Me Away

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The 3 most influential two-wheelers in history, are:
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Square, Oversquare and Undersquare engines

Square, Oversquare and Undersquare are terms that describe the ratio of it’s bore and stroke. Bore is the cylinder’s diameter, and Stroke is the piston’s travel from the very top, to the very bottom:

square engine has the exact bore and stroke dimensions undersquare is when the stroke length is longer than the bore oversquare […]

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