Table: race_results_10
Columns: year
class
tyres
team
co_drivers
pos
class_pos

Question: Who was the co-driver that had a class position of 2nd?
SQL: SELECT "co_drivers" FROM race_results_10 WHERE "class_pos" = '2nd'

Question: Which tires were in Class C in years before 1983?
SQL: SELECT "tyres" FROM race_results_10 WHERE "class" = 'c' AND "year" < 1983

Question: What is the earliest year that had a co-driver of Roger Enever?
SQL: SELECT MIN("year") FROM race_results_10 WHERE "co_drivers" = 'roger enever'