Small wheel bicycle

Small wheel bicycles are adult bicycles which have wheels of 20 inch nominal diameter or less, which is smaller than the 26" or 700c sizes common on most full-sized adult bikes. 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 20" wheels, they are not normally categorised as 'small wheel bikes'.