Cross post from "Wheels and Tires"

Cross posting here because no one in the Wheels and Tires forum cares to gave an answer Hoping a BestGen brother will care to offer some help. Needing a relatively quick answer as I'm planning on picking up the tires this evening. Thanks.

I need new tires in a bad way. Been running the 20" rims that came on my Tundra when I bought it. I picked up some 17x7 snowflake wheels quite some time ago because I want more sidewall. I found a killer deal on a set of 315/70r17 Toyo Open Country at3s. The "approved rim range" for them is 8.0-9.5-10.5. From people that really know this stuff, is the 7" rim a deal breaker? I've searched the webs and a ton of Jeep people don't seem to think it's a problem. Would appreciate hearing from my Tundra folk. Thanks for any input you can provide.

 

I could see a big-box shop like Discount not mounting them.

 

Are you sure those snowflakes are only 7”? You measure from inside to inside the lip, where the tire seats against it.

 

I think they're 7.5"

No tire shop is going to reject you over half inch of wheel width. When I had my 17x10, the 275/70r17 I had were only suited for 9.5" IIRC. Neither my Toyota shop nor Discount had issues with it.

I think your bigger issue with the snowflakes is going to be rub, due to the not-favorable backspacing. I feel like the backspace is more than 5"

 

Thanks for the quick replies. You guys are lightyears more helpful than the "Wheels and Tires" crowd.

Here's what I found about the snowflakes. The boxes they come in are for sure marked "17x7." Backspace looks to be 4.5". Have a look here for specs.

 

I think I'm going to pick up the tires and ride the lightning. Maybe grab a set of small spacers if I need to. What would be the detrimental affect(s) of running tires that are outside the recommended rim width? Fail to seal, excessive wear or something different?

 

Sometimes it helps to know the terminology so you can field varying opinions. When your tires are skinnier than your rim width, you need to "stretch" the tire. When the tires are wider than the rim width, that's called "pinch". So you're asking about pinched vs. stretched.

I don't hear a lot of cases of people running pinched setups. Basically, the risk would (I guess?) be blowout, I'm just not enough of a tire guy to know if 1" pinch is a lot, or really risky. I've run an inch of stretch before, it was harsh as shit, and I've seen people in the VW world stretch as much as 2"-3". But VW/Audi folks are a special breed of human IMHO

 

I didn’t think the snowflakes were 4.5” bs. I personally wouldn’t mount a 315 tire on a 7-7.5” rim.

 

Yeah, I have it stuck in my head they were 5" or 5.5" BS. And this topic just came up again, and I had to correct myself.

 

Care to elaborate on why? What could go wrong? Poor ride and handling, excessive wear or something else?

 

12.5” wide tire on a 7 or 7.5” wide rim won’t be very stable bead wise. 9” wide rim would be my minimum preference there. Some will mount on an 8” wheel.

 

I just read your original post and it sounds to me like the 315 tire DEAL is what you find attractive.

If value is your goal, your focus on discounted sticker prices is misplaced. The rolling resistance and the tread width will increase or decrease your fuel economy the most. For example, a budget tire will have harder, heavier compounds and lower efficiency; additionally, a wider tire makes more surface friction and lowers efficiency. The differences sometimes point to a higher lifetime cost on wide or cheap tires because of additional fuel costs. These tires also discharge snow and water more poorly in bad weather, decreasing grip.

I recommend you buy a good quality tire that suits your needs best. Do you need all-season tires, or seasonal tires? Do you need road, all-terrain, or offroad tires? Do you need better fuel economy?

 

This is the correct size for these. It's what I have. Same offset as our stock 16" 16x7 Starfish just an inch bigger diameter.


These are 7.5" wide with same offset.