Let’s see those 255 60 15 rears!!!
Before I pulled the trigger on new tires I mounted up a used 225-70/15 for a test fit. I haven't tried the 255's off my Swinger onto my 66 but I bet they would fit without trimming. Seems like enough clearance with the 225's. I'll have to try a 2.55 when the weather gets warmer. Here's the finished product.
New 15" rear tires