pianotuna wrote:
new 235/85R16 tires which will give me 1.25 inches more height; essentially they will lower the 4:56 to some other number which makes a slight difference for (better) mileage on the flat. Wider tires = lower rolling resistance = slightly better mileage. Taller tires and different side wall construction = improved ride.
Don ... raising RV height by 1.25 inches requires a 2.5 inch larger diameter tire.
Since so many Class C motorhomes come stock with 225/75R16 tires ... I guess you're saying 235/85R16 tires are 2.5 inches taller?
If so, that sounds about right because my non-stock 215/85R16 tires have a 1.2 inch larger diameter than the stock 225/75R16 tires that came on our Class C.
Interesting what you say about lower rolling resistance (i.e. wider) tires providing slightly better mileage. What that means is that when I increased my tire diameter ... that somewhat offsets the 4.56:1 differential ratio to provide slightly better mileage ... at the same time I slightly reduced mileage by going to a higher rolling resistance (i.e. narrower) tire. :h