The original Assen track was first used for the 1925 Dutch TT (Tourist Trophy) race, held on country roads through the villages of Borger, Schoonloo and Grolloo, and organized by the "Motorclub Assen en Omstreken". The brick-paved track had a length of . The winner was Piet van Wijngaarden on a 500 cc Norton with an average speed of . In years afterwards the Dutch TT was held on a street circuit through De Haar, Barteldsbocht, Oude Tol, Hooghalen, Laaghalen and Laaghalerveen.