 Cars in the 1940s and 1950s were unpredictable in their reliability, with almost any component susceptible to breaking.He won 24 World Championship Grands Prix, 22 outright and 2 shared with other drivers, from 52 entries – a winning percentage of 46.15%, the best in the sport's history (Alberto Ascari, who is second best, holds a winning percentage of 40.63%).Both drivers were already experienced Grand Prix drivers before the world championship started.