Lauriebe
Found on the Wikipedia description of the Russian BA-I or BAI armoured car from the 1930's
"An interesting idea that was borrowed from the earlier D-13 armoured car was mounting of spare wheels just next to the front wheels and only slightly higher. These helped when crossing trenches and rugged terrain".
BA-I - Wikipedia, the free encyclopedia
BA-3/6 - Wikipedia, the free encyclopedia - shows a photo
BA-3, BA-6, and BA-9 Armored Cars - ENGLISH.BATTLEFIELD.RU - ENGLISH.BATTLEFIELD.RU refers to the spare wheels as "freely rotating"