Qualification
Seven riders are seeded straight to the final round while nine other riders qualify through three qualifying rounds held on a regional basis which use the same format as the final round. The 1st, 2nd and 3rd place riders from each qualifier ride in the final round and 4th place riders take part as reserves. In the final round the reserves may take the rides of any incapacitated rider, replace any rider excluded for a starting infringement, or replace any rider excluded for exceeding the two minute time allowance except in the semi-final or final.
The top three riders go through to the British Speedway Championship final and the winner qualifies for the World Junior Championship semi-final round. The next five finishers qualify for the World Junior Championship qualifying rounds.
Read more about this topic: 1989 British Speedway Under 21 Championship