I just put a 3 inch lift on my trail and planned to install 285/70/17 Duratracs on the stock trail wheels. I was told by a large tire dealer that 285's were too big for the stock wheel, would make the center of the tire (tread) bulge and wear fast and thus were not recommended. Anyone else run into this? Valid?
285's Too Big for Stock Trail Wheels?
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1engineer
Moderator
http://www.toyota-4runner.org/5th-gen-t4rs/87546-will-285s-fit-black-wheel-question.html
http://www.toyota-4runner.org/5th-gen-t4rs/91819-285-tire-size-questions.html
http://www.toyota-4runner.org/5th-gen-t4rs/84663-265-up-285s.html
www.toyota-4runner.org/5th-gen.../81133-tacoma-wheels-285-70-17-bfg- mts-installed-print.html
www.toyota-4runner.org/5th-gen.../106948-285-70s-stock-sr5-wheels.html
www.toyota-4runner.org/5th-gen.../110859-285-70s-cooper-st-maxx-stock- sr5-wheels.html
http://www.toyota-4runner.org/5th-gen-t4rs/91819-285-tire-size-questions.html
http://www.toyota-4runner.org/5th-gen-t4rs/84663-265-up-285s.html
www.toyota-4runner.org/5th-gen.../81133-tacoma-wheels-285-70-17-bfg- mts-installed-print.html
www.toyota-4runner.org/5th-gen.../106948-285-70s-stock-sr5-wheels.html
www.toyota-4runner.org/5th-gen.../110859-285-70s-cooper-st-maxx-stock- sr5-wheels.html
Winstondvm
New member
I run 285/70/17 BFG T/A on my stock trail rims with a 3" Toytec ultimate lift. I was told by one dealer the same thing you were. I went ahead and had them installed, have about 14K on the tires/ setup, have them rotated every 4-5k miles, and haven't had any issues with them wearing excessively in the middle.
1engineer - thanks - I took the time to read each of the threads you linked but didn't see an answer to my question - I may have missed it. I'm not asking about rubbing issues - but rim width on a Trail. It was my understanding many folk are running the 285s on stock Trail wheels - i could be wrong.
Winstondmv - Good to know you haven't had any issues - new wheels weren't exactly part of my immediate plan.
GrantK - the sales rep told me 285s inflated to required standard pressure would buldge... even when not overinflated.
Winstondmv - Good to know you haven't had any issues - new wheels weren't exactly part of my immediate plan.
GrantK - the sales rep told me 285s inflated to required standard pressure would buldge... even when not overinflated.
shadow247
New member
Recommended rim width for a 285 is 7.5 inches. Does that mean your Runner will explode in a spectacular ball of fire if you mount them on the stock 7 inch wide wheels? No way. 285's do look better on a wider rim, but they will work just fine on a 7 inch rim. FWIW I ran 2 sets of 285's on my Chevy Z71 with stock 7 inch wide rims and never had any issues.
1engineer
Moderator
Post #7 in the first link I gave you above. This guy ran stock wheels with 285's. If you are asking anyone to certify that 285's will fit with no issues including wear to the middle, good luck with that. Anyway, my examples just show yes, people do mount 285's on stock rims.
"EDIT: the 285 tires mentioned above were P285/70R17 Goodyear Wrangler Silent Armors mounted on stock TE wheels and if they ever rubbed, I never noticed it. I added the new TRD wheels recently and the tires started to rub the mudflaps just a bit (mostly when in 4H and turning at near full lock) -- I think the offset/backspacing of the TRDs is just a bit different than the stock wheels but haven't confirmed this yet. Anyway, I got a set of LT285/70R17 Duratracs mounted this past weekend and they are at least 1/4 in taller overall and have a ~1/2" wider tread contact patch than the Silent Armors. These Duratracs definitely rub the mudflap when turning and the suspension compresses in normal driving (i.e. turning into a parking lot, etc). I have the mudflaps removed right now and am investigating if the tires are going to actually rub the body mounts that are located behind the mudflaps -- initial driving the past 2 days looks promising that I won't have to break out the grinder and chop off some of that useless steel on the body mount, but I need to find a few rocks/moguls and flex the suspension to know for sure. I'm getting ready to add some adjustable Bilsteins and will have the alignment done after the install and am going to have them increase the caster per Harper7's recommendation above. "
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Shadow274 - Now i am totally confused (which doesn't take much) since the trail has a 7.5 rim versus the 7.0 on the SR5 - and the sales guy knew that.
Funny thing - I'm running a second set of 285s (duratracs) on my Chevy Z71 as well! I haven't had a problem - didn't realize it had only a 7 inch wide rim. Same sales guy sold me those....
GrantK - i bet you are dead on but i figured better be safe and ask those on this forum that know.
I'd still appreciate to hear if anyone with a bunch of miles on 285s on stock trail wheels has center wear issues.
Funny thing - I'm running a second set of 285s (duratracs) on my Chevy Z71 as well! I haven't had a problem - didn't realize it had only a 7 inch wide rim. Same sales guy sold me those....
GrantK - i bet you are dead on but i figured better be safe and ask those on this forum that know.
I'd still appreciate to hear if anyone with a bunch of miles on 285s on stock trail wheels has center wear issues.
TOPDECK
New member
He has TE wheels. TE wheels are already 7.5'' . The sidewalls on 285s with stock TE wheels are pretty flat, not bulged out (making a more bulged center). Per America's Tire when I got mine, their computer said that 285s were fine for the TE, but not the SR5.
Thanks for the responses. For what its worth, no other salesperson stated that the 285s were too big for stock rims - so I went with it. I had a 3 inch lift installed and am running 285/70/17 duratracs with no rubbing. I have not had the chance to get out and flex it however.
phillyd2
Senior Member
I'm bumping this because of a few posts in the For Sale thread and did not want to sidetrack there. (And there is no way in hell I'm starting another 285 tire thread). I was planning on 285 Duratrac on 7.5" wide TE OEM wheels. Any issues like mentioned below?
453030
New member
Philly,
It is just what I have learned. I know guys like Marc (Intruder) run a 285 on a stock wheel and obviously he has wheeled hard. My wheeling is usually rocky trails, and I am simply more comfortable not being at the bottom of the specified wheel width when airing down. My local Discount Tire has been superb to work with, they have done all my work correctly, and the guys who are actual wheelers recommended a wider wheel for a 285 and my kind of off roading. YMMV.
As you quoted me replying before, the 7.5" wheel is OK for mounting a 285.
It is just what I have learned. I know guys like Marc (Intruder) run a 285 on a stock wheel and obviously he has wheeled hard. My wheeling is usually rocky trails, and I am simply more comfortable not being at the bottom of the specified wheel width when airing down. My local Discount Tire has been superb to work with, they have done all my work correctly, and the guys who are actual wheelers recommended a wider wheel for a 285 and my kind of off roading. YMMV.
As you quoted me replying before, the 7.5" wheel is OK for mounting a 285.
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phillyd2
Senior Member
ok, I'm confused (not a hard task). 285 are within spec and others run them and air down with no issue but somebody advised you not to? I know this comes out as a jerky statement but please believe its not what I intended, just not sure how else to phrase it.
I'm just looking for more real 'facts' one way or another.
I'm just looking for more real 'facts' one way or another.
1engineer
Moderator
Let me see if I can explain:
A tire (any tire) is produced to have a "natural" shape when inflated. Here is a section view of a tire/wheel:
The red lines are the tire. With a stock wheel/tire combination at normal inflation pressures the tire is not wanting to put any excessive outward force up against the bead because it is at it's design shape. Now let's say you added a wider tire. As you can see by the diagram the tire at the bead will want to expand to it's natural design state which is wider than the wheel but the wheel lip, or bead, prevents that. As you "air down" or decrease tire pressure for a trail, there is less force (because of less pressure in the tire) exerted to keep the tire pressed up against the bead. When you hit a ledge or bump while off road that will tend to "squash" the tire outward in that spot. Since you are running a wider tire than specified that means the tire will try to go to it's natural shape and can become "unseated" or even have the tire extend over the rim which will then deflate suddenly, leaving you to learn more about using your high lift in uneven terrain lol. This is why bead locks were invented.
Now, you COULD run the bigger tires on narrower rims for years with no problems or you could roll the tire the first time out. There is no rhyme or reason as it depends on whether you hit it exactly right. Your chances of doing this go down by running the correct and specified wheel width for the tire. Hope this helps.
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phillyd2
Senior Member
My hero, again!
I know others run tires that are specified for 7.5 min on 7" wide LTD wheels which I would not do.
But.....7.5" is correct and specified wheel width for the tire (285) allbeit at the bottem of the spec. So, would this still be a concern?
1engineer
Moderator
This is entirely up to you. Of course being in the middle range is better but at the lower end could be just fine. YOU have to make that call big boy.
