There were also other derivatives, which were sold as the Fiat-Abarth 850, Fiat-Abarth 1000, and Abarth Monomille (1000 pushrod). For the 1960 Gran Turismo racing season the classes were changed to under 700 or under 1000 cc, while national competitions also featured an 850 cc class. Abarth responded with engines suitable for the new classes, although the 700 may have only been built in one or two examples. Depending on the state of tune, these then received additional letters to their names, such as TC or TCR. A twin-cam version, the "Bialbero", was also produced.