Quote:
Originally Posted by rgodfrey
why would Ford do that?
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hi rgodfrey and welcome to the forums...
to save money thats why!
the spare wheel is less expensive than those 20 inch wheels.
your spare is 0.2 inches larger diameter than the other 4....
this should have zero impact mechanically IF the spare is needed for duty.
the spare has 1 inch higher sidewall...7 vs 6. but is basically the same overall size because of the 2 inch wheel difference.
approx 1/2 inch circumfrence difference
the higher sidewall could in theory, have an impact on high speed cornering, and steering.
but in real world use...nada.
you'll have to sort out the load ratings on your own. the info is on the side wall of both tires....and the pirelli web site.
for a small trailer and urban life in a mild climate, the 20s work.
the 20s need more attention to balance and alignment and wear issues and proper inflation.
with a bigger trailer or rougher roads, off roads, winter travel...the 18s would be a better choice.
for cross country trips or life full tiime on the road, i'd prefer a more widely available and less expensive tire/wheel combo than the 20s...
but they are sweet looking...
i wish ford offered a 'lincoln mark' version of the superduty!
cheers
2air'