| Category | Superstocks |
|---|---|
| Country |  New Zealand |
| Inaugural season | 1965 |
| Drivers | 125 (2020) |
| Drivers' champion | Todd Hemingway 1NZM or 99M |
| Official website | speedway.co.nz |
 Current season | |
Superstocks (previously known asA Grade Stockcars) are a premier class ofNew Zealand Speedway (dirt track racing). Cars are of bespoke design with integralroll cages built to rules provided by Speedway New Zealand. Superstocks weigh 1,400 to 1,500 kilograms (220 to 240 st; 3,100 to 3,300 lb) and are usually powered with modified production car engines of up to 248 cubic inches (4,060 cc). Contact between cars is allowed and is intended as part of the class, with the closest finish in the classes history coming at the Sharp As NZ Superstock GP at Oceanview Speedway during the 2023/24 season with who at the time was the current 2NZ being Josh Prentice beating Wanganui Local 26V Kailen Mooney by 00.014 Seconds.
Cars are purpose built by numerous different builders throughout the country.
Among others.
Superstocks usually run engines such as
Cars come in all different shapes and designs, varying from the ever-popular and successful Gordge chassis, through to the 'Tank" popularised by Dave Evans, and the now popular Rees Race Cars Chassis built by Peter Rees and his sons Asher and Ethan at Rees Race Cars
Superstocks compete in individual championships nationwide, including:
These championships are seen as the major events, and the big ones to win. Numerous other events are run throughout the country, ranging from track championships through to series run over a number of meetings.
Another major meeting is the annualNew Zealand Superstock Teams Championship, run atPalmerston North International Speedway, in the first weekend of February.