Small-wheel bicycle

A small-wheel bicycle, sometimes called a mini velo or mini-velo, is an adult bicycle with a reasonable sized frame and relatively small wheels, usually of ETRTO 406 mm (20") or less nominal diameter, which is smaller than the common 622 mm (700c) road bicycle wheel size or 622 mm, 584 mm or 559 mm (29, 27.5 or 26") gravel and mountain bike wheel sizes common on most full-sized adult bikes.

They can be folding or non-folding. While many folding bicycles are small-wheel bicycles, not all small-wheel bicycles can fold. Some small-wheel bicycles neither fold nor separate, such as the Moulton, which comes in both fixed-frame and separable-frame versions.

While BMX bikes also have ETRTO 406 mm ("20 inch") wheels, they are not normally categorised as "small-wheel bikes".