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
mich800 wrote:
The performance difference is not nearly as dramatic as some would like you to believe. It seems like some see 20" and see some huge difference in net size. In actuality the difference in total diameter is a little less than one inch or right around 1/2 inch difference in sidewall height.
^ THIS! rim size is just rim size. What matters is the tire's overall measurement. The tire sizes are extremely similar and really don't affect much as to a fart in the wind. Overall diameters are similar. Now what makes a difference is the hit in the ol' wallet when it comes time to replace a tire. Typically, a lower profile tire will cost more than the taller sidewall tire. Go to tirerack or wherever, input a super duty, and then check out tire prices for both OEM sizes. Also note, tire capacity is roughly 3,800 lbs per tire on the 20" rim (I bought the OEM superduty sized tire for my F-150 when I wanted a cheap taller tire and it was the cheapest 34" tire I could find) versus the previously posted number for the 18" tire.
