A friend of mine was travelling home in his nice 1958 Ford Mainline Ute. heading home out on the highway, he was sitting on 60MPH when the car started to give signs that something was not right. He slowed down some, and continued on. However, the problem still existed. When he did a visual check, everything seemed OK and he continued on to his next overnight stop. Looking under the car, he saw that something was wrong with one of the front wheels? This is what he saw. The inside of the 16" wheel had split, but the tyre still remained inflated. He put the Spare Wheel on and continued on his journey with no further problems. All told, he traveled 2000 km round trip. What is the cause of this? Do these Ford Rims split very often?