Join Date: Aug 2010
Location: Port Elgin, Ontario
The wheel size (18" or 20") doesn't matter so much as the circumference or rolling diameter of the tire.
You need to change the height of the sidewall to make sure the rolling diameter is the same, otherwise the computer will not be happy.
When I had my FX4's, I was running 18's, but there was a better selection of snow tires in the 17" category that were actually cheaper.
The XL models come with 17's, same brakes, so they fit fine on the FX4, and I just went with a tire size that gave the same rolling diameter.
You can actually find on-line calculators that will do the number crunching for you and tell you how close the two sizes are, how far off your speedo will read, and what size tires to use to work with the Taurus.
Incidentally, check the lower end of the Taurus models, I ordered plain jane , black steel wheels off the XL from the dealership, and they were pretty reasonably priced.
- 6550 lb bundle of joy