Depends on use. For my use the 12.50’s work extremely well and have since 1987. But I’m on the West coast and conditions here may be markedly different from other parts of the country. I originally ran 8” wheels but later went to 10” wide and have been happier. Flatter tread footprint, better handling, better traction. Just have to be more mindful about airing down. Just my experience and opinion for my use. That and $5 may get you a cup of coffee. (I don’t drink coffee so guessing on that cost).