Three main factors determine any vehicle's value, according to Karl Brauer, editor-in-chief of Total Car Score.
Those factors are rarity (how many initially produced compared to how many are left today), innovation (was this vehicle a technological breakthrough when it debuted), and whether it has a successful race history (which always increases value).
Brauer compiled this list of what he says are the 10 most-valuable motorcycle models. The rundown includes scarce antique models and in one case, a motorcycle that appeared in a famous photo. Click on to see those bikes, with values starting in the low six figures and going up to a million dollars.
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By Colleen Kane