All Terrain Tires

After reading through a few other threads on similar topics, and considering my own up-coming tire purchase, i thought I would revive this idea.

Cutting to the chase, I'm considering replacing my current tires with Yokohama Geolandar g015 all terrains in 205/75R15

As I understand it, these will be the trade-offs:
+ enhanced traction in poor driving conditions (gravel, mud, snow, rain)
- decrease in fuel economy, inaccuracy of speedo, reduced cornering

From my searching, these tires seem to be the A/T's that will most easily fit my Prius, and most closely (short of running some 25" ATV's on a 12" rim with a 5x100 bolt pattern adapter). Before I go through with it, any words of caution on something I may have missed?

 

Sorry, I meant 205/70R15

 

Thank you for the responses. I appreciate the feedback.

Not that anyone said this, but just so there's no confusion, let me give assurance that I did not purchase my Prius with the misunderstanding that it would be ideal for rock-crawling or mud-bogging. I'm now spending less than half of what I previously budgeted for fuel, so it's just that I'm in a position that I can accept a 10% (or 25%, for that matter) drop in fuel economy and still come out ahead.

Growing up in Florida, snow tires are relatively unfamiliar to me. While they do have an appeal, my understanding is that they are not for year round use, and I need to stick with a single set of tires. If I can use them year round, that would be a possibility.

Regarding the change in size, as I figure, the sidewall height of the stock 185/65 would be 120.25mm whereas the sidewall height of the 205/70 would be 143.5. This is a difference in radius of 23.25mm or ~0.92".

As for rubbing when bottoming out, even assuming there's no spare room, wouldn't 1" of lift more than cover it? Even the $20 spacers at Autozone advertise up to 2" of lift possible.

:: shrugs ::

 

So in the end, it looks like y'all's advice will prevail. The death knell was my mechanic who assured me that a decent set of all season tires should be adequate for anything that doesn't bottom me out, and that for anything that does, no A/T's will save me, anyway.

Of course, I interpret this to mean: "if you're throwing the speedo off any way, don't go part way - open up those wheel wells and let's see you put some 32" M/T's in there!"

In the meantime, therefore, I think I'll pick up a set of Douglas All Season in 185/65R15 :: sigh ::

 

The article says they fit 29's on, but how? When I test measure for 215/75R15's, my template hits the spring perch, and that would represent a tire of <28" in diameter :: scratches head ::

 

Sorry, I meant the Jalopnik article posted by Vman about the Gambler 500 Prius

 

The builders are named Matt Kempton and Sarah Cooley. He works for Boeing, and she for Microsoft. They live in Seattle with their cat, Jean Luc Piccat. I can find their social media, but not their contact info.

Based on graphics on the car, I tried Hoonigan, but they claimed no knowledge. There's also a Kempton Auto in the northeast, but they said they are unaffiliated

 

The same company is sending me the lift kit also (the largest was 40mm, so I think the article is a little off on their measurements). The thing is that the strut spacers would go at the top of the strut, which would give more clearance to the wheel wells, but I wouldn't think it would do any good as far as the spring perch.

My theories are 1) wheel spacers or 2) my measurements do not account enough for the curvature of the tire's cross-section