17x7 +38 rims with 215/45/17 tires

[PetersRedYaris]

You should run 205/40/17 (slightly smaller (what I use)), 205/45/17 (slightly larger), or 215/40/17 (exact stock replacment). A 215/45/17 is really tall; you WILL rub if you lower your car, maybe even without lowering.

[kimona]

Originally Posted by PetersRedYaris

You should run 205/40/17 (slightly smaller (what I use)), 205/45/17 (slightly larger), or 215/40/17 (exact stock replacment). A 215/45/17 is really tall; you WILL rub if you lower your car, maybe even without lowering.

205/45/17 is OEM (T-sport) @ 24.3", and this is the size you should run if you don't lower the car.

215/45/17 @ 24.6" is not much taller (1.6%), and it won't make any significant difference in height whatsoever; you'll just have a wider footprint. If you don't lower your car, you would be fine, but the sidewall may poke out a bit up front with a 7" ET42mm, and will definitely stick out with with ET38mm.

So, as Peter indicated above, you should run 205/40/17's if you plan to lower your car. You can stagger the sizes front to rear if you like. Staggered wheel widths, offsets, and/or tire sizes are a common application on the Vitz in Japan.

You could run 205/40's up front and 215/40's in the rear. This would look excellent and compensate (5mm's) for the obvious FR/RR difference.