To explain the lure of speed you would have to explain human nature; but it is easier understood than explained. All men in all ages have beggared themselves for fast horses or camels or ships or cars or bikes or aeroplanes: all men have strained themselves dry to run or walk or swim faster. Speed is the second oldest animal craving in our nature, and our generation is fortunate in being able to indulge it more cheaply and generally than our ancestors. Every natural man cultivates the speed that appeals to him. I have a motorbike income.