As explained in "The Five Greatest," Italian engineers Piero Remor and Carlo Gianini placed the inline-Four engine of their 1923 Rondine in the chassis transversely instead of longitudinally, as had been the tradition with previous four-cylinder motorcycles. This not only solved an uneven cooling problem but also allowed four-cylinder bikes to have a more reasonable wheelbase. But in the 1930s, another Italian maker, Moto Guzzi, tackled excessive wheelbase length in a different way. The Guzzi engine's single horizontal cylinder made the engine rather long, so to compensate, the two transmission shafts were "vertically stacked"—placed one above the other—as a means of reducing their contribution to engine length. Yamaha adopted vertically stacked transmission shafts on its 500cc Grand Prix bike in 1984 and put the design into production on the 1998 R1. Since then, one after another maker has adopted this feature to make engines shorter, front-to-back.