Samenvatting
An experiment was conducted varying bicycle crank length as a ratio of cyclist's crotch height over a range from 0.17 to 0.23. Heart rate, oxygen consumption and perceived exertion measures were taken. All measures showed the superiority of a crank length of about 0.20 of crotch height. The standard crank is too long for 60% of adult males and almost 100% of females.