CREATE TABLE table_57537 ("Race" TEXT, "Circuit" TEXT, "Date" TEXT, "Pole position" TEXT, "Fastest lap" TEXT, "Winning driver" TEXT, "Constructor" TEXT, "Tyre" TEXT, "Report" TEXT)

In the Canadian Grand Prix, what tyre was used when Jacky Ickx held pole position?
SELECT "Tyre" FROM table_57537 WHERE "Pole position" = 'jacky ickx' AND "Race" = 'canadian grand prix'
SELECT "Tyre" FROM "table_57537" WHERE "Pole position" = 'jacky ickx' AND "Race" = 'canadian grand prix'