Schwalbe Marathon GT 365 . 1 TIRE. 4 SEASONS, 365 DAYS NO TIRE CHANGE NECESSARY. The Marathon GT 365 is the first tire which you will ride safely throughout the year in almost every condition. The new lamella tread and the specially developed "FourSeason" compound provide full grip, no matter what time of the year you ride your bike. However, loads and average speeds of these bicycles are higher than that of normal bicycles. Therefore,.