It’s 40 years since Pikes Peak International Hill Climb legend Bobby Unser earned his 10th and final King of the Mountain title in 1986 (main image). Some 18 years after his ninth overall win on the storied Colorado 14er, and four years after calling time on a racing career that...

The European assault began with the spectacular Group B machinery, then continued with ever more outlandish machinery that piled on the power, aero and tech in the thin Colorado air.