19" Genesis Rims - Different Tire Sizes?

KurticusRex

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If this has already been posted, I missed it, please direct me to another thread if applicable.

Two questions I can't seem find a clear answer to:

1. On the 3.3T, does the standard trim come with 18" rims and the upgraded 3.3T trims come with 19" (10 spoke or the Sport)? I understand the G70 18" rims to be a square setup (all 4 tires are 18-inch alloy wheels (P225/45R18) with Michelin® all-season tires).

2. The 19" rims are staggered wheel size: Front: P225 / 40 R19, Rear: P255 / 35 R19. I understand this means the REAR tires have a narrower sidewall profile (35 Rear vs 40 front) but are wider track (255 rear width vs. 225 front). Is this correct? If so, does it seem odd that the rear tires on an AWD vehicle have a skinnier profile than the front? I don't get how this makes sense.

I could totally be missing something, but I just noticed this profile difference and would like to know if my understanding is correct and why Genesis has a different sidewall profile on a staggered AWD vehicle. Please, give me knowledge.

TIA.
 

Throat Yogurt

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Genesis G70

KurticusRex

Registered Member
51
41
18
Genesis Model Type
No Genesis Yet!
Actually the front and rear tires on the 19" wheels have almost exactly the same sidewall height. The problem is that you are mis-understanding the tire sizes. The 40 on a 225/40 R19 is an aspect ratio...the ratio of the tire width to sidewall height. So because the rear tires are 255 mm wide, they require a smaller aspect ratio (35) to have the same sidewall height as the fronts.
Aspect ratio. Ratio? RATIO! Of course that is so freaking logical I'm pissed I didn't figure it out on my own. Makes perfect sense.

TYVM, Sir Yogurt.
 

danygenesis

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Genesis G70
Front: P225 / 40 R19, tire height 90mm
Rear: P255 / 35 R19. tire height 89.25mm
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