What terrain will you be riding on?

Is this an urban, GP, or off-road BOK (Bug-Out biKe)?

You could ride a single speed "cruiser-style" for 50 miles if need be. Someone could pretty much ride anything for 50 miles without much more than enough clothes to disguise your birthday suit.

Need more parameters defined before the discussion can continue. 50 miles is too generic.
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"Its not a matter of being ready as it is being prepared" -- B. E. J. Taylor