The most common sizes of bicycle wheel are 16″ Wheels (ISO 305 mm), 20″ Wheels (ISO 406 mm), 24″ Wheels (ISO 507 mm), 26″ Wheels (ISO 559 mm), 27.5″ / 650b Wheels (ISO 584 mm), 29″ / 700c (ISO 622 mm), and 27″ (ISO 630mm).