Biggest tires you can put on a stock Prius?

2010 Gen 3 III trim. This has recently crossed my mind. I've seen examples of people putting bigger tires on the stock 15" rims but they also have a Tema 4x4 lift. It looks like there is quite a bit of room. The main worry would be the front when turning. Using tiresize's calculator 205/65R15 sounds like it would fit and wouldn't mess the speedo up too much. I've recently realized the Prius V actually has bigger tires/rims than the regular Prius. Probably half a year ago I saw one at the bank and was checking out it's tires and thought they looked kind of big.

Not sure I will go this route, if I actually ever buy tires, but does anyone know the biggest you can fit on a stock Gen 3 Prius?

 

I could not find them with "priusoffroad" searched in google.

I've needed new tires for a very long time and keep putting it off. At the rate I'm going, the car could be done before I put new tires on it. If the car passes my oil test, I will put some money into the car. Some of the roads I drive on are kind of shoddy and I want more comfort and newer tires that are not the cheapest tires you can get, must have better handling as well. (I'm looking at a bigger tire for comfort and a better tire for handling)

Feeling around I think I could safely put 215/XXR15 on, but others input before I spend $400~ on tires would be good. (After my oil test that may start in a week or so, user error) Local shop apparently has a tire I like in 205/65R15 92H, which is the biggest size in a 15 rim that they have, but I'm still looking around and may have found other problems with the car, related to crappy roads.

 

So I've put about 2-4k on it since doing both of these things. For a little while I tried out tires only. I only had the fronts rub on some bumps/dips in the road for the most part. Not really sure where it was rubbing. But I was still scraping stuff. Then I got the Prius Offroad 1.5" lift. I did at one point notice a shield in the driver side wheel well coming off. It was more towards the front and inbetween the wheel and engine. Had 1 of 3 push pins left. (Something like that) Fixed it.

When I first put tires on I thought it was reading 3-4mph lower but I think it's gone back up a little bit. It turns out that this made my fuel mpg trip meter almost dead accurate. I don't remember much about pre lift but I pretty much went from 38mpg to 28mpg from tires. I sure can get my trip meter to say 35mpg on my way to work but it's slower then it was without the bigger tires and I don't have time for that or the people around me.

Lift wasn't too bad to install. The only difficulty was the front right drive shaft and trying to line the struts back up with the scribe lines we made. I had to take my tires to another shop to install because the first one which I think was a Fire Stone refused. Which was where I had them shipped from tire rack.

I bought Yokohama Geolandar A/T G015 215/70R15 for my stock 15" rims. I think I settled on 33PSI F/R. 32/30 is more comfortable but you do feel the drag. Took a little getting used to. They put 35 F/R and it felt really floaty/drifty on the highway home. It will go 110mph+ setup like this. These tires are the best I've ever had and am sticking with Name brand tires. My other car had crappy Kumho and cheap brand tires. RIP Honda. My Prius had Douglas all seasons 195/65R15 and they were alright in the dry but really sucked in the rain. There were at least 2+ instances where I'm trying to stop/slow down and it's just not doing it. Pressing the pedal more and more until abs is kicking in. ...Yeah, screw cheap tires.

I towed a trailer with it, 2040lbs 300-400 tongue, underinflated tires for everything, primarily trailer. Towed it up to 75mph I think it was. Liked 65mph better. Oversized AT tires did not help towing at all. Got about 17mpg towing. Which is pretty much what the smaller pickups get empty. May have drastically increased oil consumption. Random burning smell from AC that I could not trace/figure out trying different settings. I have yet to tow again. At the time I was wanting a boat, still do, but being financially responsible sucks.



Stock


AT Tires


Tires and Lift


Tires at least unsure if lift


Towing trailer 2040lbs 300-400lbs