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[quote=Charles Lasitter;9034]Tires have specs for section width, rim width, and rim width range.
(Plus lots of other stuff).
Looking at a Pirelli PZero Nero 225/45-WR17, it lists a rim width of
7.5" and a rim width range of 7-9".
If this wide tire were mounted on a 17x7" wheel, it would seem that
the sidewalls would protrude a bit on either side, offering the rim
some small level of protection against curb scrubbing.
That would seem to be a good thing, but what I need to figure out is
if there are any handling / ride considerations for using a 7" rim
versus a 9" rim.
Any implications for sidewall flexing / rolling resistance / contact
patch / "spring" effect on a tire as a car enters a corner?
Using a 7" rim width cuts the actual section by half the rim undersize; in other words a 225 tire width on 7.5" rim drops to 219 mm on a 7" rim. It also means a drop in tire pressure if you want to keep the tread flat on the ground.
Aside from that why would you want a 225 tire on a fit; its pretty difficult to get it in the fender and besides its too heavy and too big in diameter to have any use at all. Sorta like a VW bug with 255/50x15 tires. Thing couldn't get out of its own way.
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