Q. What is the most popular size frame, and do you try to buy bikes in that size to flip?
Q. What sort of bikes are most in demand?
Q. What is the average price most are willing to pay for a used bike (to where it gets harder to sell a bike above this price)?
and in a completely unrelated question (too small for its own thread)....
Q. To protect a bike kept outside from rusting in the rain, is it better to cover it with a tarp or leave it uncovered; on the premise that it will dry faster uncovered, than it would covered, which might encourage humidity inside the tarp?