New superduty - 18" or 20" wheels
I'm looking at ordering a crew cab shortened gas f350 with 4.30 axle to tow a Montana fifthwheel (11,700#dry). What are the advantages or disadvantages of the 18" wheels versus 20" wheels.
Forum Discussion
Lynnmor wrote:Grit dog wrote:Lynnmor wrote:has nothing to do with rim dia, only OD of tires.
A larger diameter tire will have the same effect as a higher gear ratio. You choose what is the most important; pulling power or looks.
No diff between OE 18s and 20s other than looks and cost of tires.
The difference is about 7% which is the difference between the 3.31 and 3.55 gears offered by Ford. Whatever makes you happy, but I chose the 18" with the 3.55 gears.
It is actually about 3%. Ford uses 275/70 R18 or 275/65 R20 tires. Circumference difference is approximately 2.8% larger. Revs per mile difference is 2.7%. So that would make the 3.55 effectively 3.49
