I am thinking about switching from the original bias to newer radials on my 42 1/2 ton. I have the original 16" pie cutters but also found a set of 15" which I'd like to drop down to. Both 4" wide I believe. Rumor has it that the vehicle perform better with Bias as strange as that may sound. I also like the old school look. I saw a 50'2 style with 215 70r15. Anyone got tips on options, tire sizes, type, etc?