[Phil Waterman]

Hi

There are some of the 60 series that have the smaller brake drums to use the 16" which are 8 lugs these trucks will take either 16" or 20" see picture of my C60L during change over. The 16" wheel brake drums backing plates on those trucks measure approximately 16 1/2 diameter while the 20" wheel brake backing plates are 17 1/2". The 16" wheels don't fit the larger drums I tried.

Difference in wheel size had to do with use truck, weight and date of production. I've heard that the smaller tires were also used to save on rubber and to make some vehicles like ambulances, easier to load. Also the smaller diameter tires would deliver significantly more torque to the ground at the expense of speed. This would explain their use for towing anti-aircraft guns. From experience with my C60L the torque makes shifting out of 1st gear difficult but use of 1st is also limited. With the 16" wheels you can expect to be pasted by people on bicycles.