33" tires (50-55lb) or 34" tires (60-67lb)?

Center of mass should be directly on the axis of rotation, varying only in longitude along the rotational axis depending on rim offset. Distribution of weight is a concern, but I don't believe I could obtain enough information from any of the manufacturers to go much further than what I've done so far. If I had a decent model of the wheel and tire, I could apply mass properties and provide a much more accurate model.

 

Thank you for the awesome calculator!

I still don't have the truck, but am leaning toward going with the 34s as it has the OEM lift. The Toyo A/T3 in LR C is current frontrunner, lightest option for a good 34 I can find at 59lb.

I'll be going up 55% in rotational inertia if I stay on stock wheels. But only some of that is fair given that the OEM tires are 36lb, which is absurdly light and just plain inappropriate for the vehicle. A reasonable baseline would be a BFG KO2 in 265/70R17 load range C, at 46lb. In that case I'm up 35% in rotational inertia. If I run RRW 20lb wheels...that number would fall 39% over stock with "fake" tires or 20% over stock with "reasonable" tires.

 

Yeah I guess I mean a rough approximation of the mass distribution as a single weight and diameter number. Not center of mass. I’m not engineer enough to know how to say it