" A bicycle, certainly, but not the bicycle “ said he. “I am familiar with forty-two different impressions left by tyres. This as you perceive, is a Dunlop, with a patch upon the outer cover. Heidegger’s tyres were Palmer’s, leaving longitudinal stripes. Aveling, the mathematical master, was sure upon the point. Therefore, it is not Heidegger’s track. "

― Arthur Conan Doyle , The Complete Sherlock Holmes