Bicycle frame size in classified ads
 

Why do people who sell bicycles on the classified ads almost never include the frame size of the bike? Frame sizes range from about 13 inches to 23 inches. They will often say that it is a 26 inch bike, but that is the diameter of the tires, not the frame size. Please measure the frame size of the bike and include it in the ad. It is especially important for short and tall people.

It all depends on the bike. My Trek Madone is a Large, 60cm. most frames are S-M-L. My Specialized is a Large 56 CM.