33 inch tires?

By the way, the "285" is the nominal width of the tire at the widest point, in mm.
The "70" is the height of the sidewall as a percentage of the width (ie 70% of 285mm).

Hence 285/70 is the same width, but not quite as tall, as 285/75. To complicate further, wider rims will "squash" the tire flatter, while narrower rims will end up with the tire sitting a bit taller but narrower. So 285/75 on 8" wide rims will be taller and narrower than 285/75 on 10" wide rims.

 

I'm sitting here with a brand new 285 MTZ with 40lbs of pressure in it and its measuring out as 32.75 ish and Mickey thompson claims its 33.1 overall high..
So a little bit of false advertising going on there me thinking

 

Good point!!

 

Not to necessarily argue either side, because in the end the actual size difference is negligible...but all numbers given by manufacturers are based upon unloaded measurements.

 

OK, well the OP has an '02 Pre-Runner. My advice, if you don't mind a narrower tire, try shooting for a 255/85/16. I'm running them for my Maxxis Bighorns, no rubbing issues on the frame at all, they still rub on full stuff, but if you're not off-roading that won't be an issue. I think measured out, they are almost 34" tall when new, but they look damn good IMHO.

Since I do off-road, I'm going to cut the fenders some.. But that's me.

 

Ok, so I'm still a little confused. Can I increase my tire size with a stock rim and a 3" lift without rubbing? Or am I stuck with the size I have now?

 

Completely agreed.... the size difference is neglilible..was just showing that the websites arent always accurate in there measurements.
However this tire is sitting in my kitchen right now unloaded.. the ones on my truck are measuring 32ish i believe..

 

I thought you said it had 40lbs of pressure in it?

 

I'm not using the stock rim, but mine is an 8inch with a 4.5 BS and i get rubbing at full lock and stuff, nothing major but its there.. I just have to trim a bit more.. hopefuly someone with a stock rim will chim in

 

It does, I just had it mounted onto a new rim for a spare a few hours ago while i was picking up my winter tires, and they filled it to 40 lbs.. Sorry when I said "unloaded" I ment not on the truck, I wasnt refering to the pressure .. was that the confusion??

 

How do you like those MTZ's btw? Have you run other mudders to compare to?

 

PM sent .. Will let this thread get back on topic

 

You can increase tire diameter with the stock rims up to approx 32" outside measured diameter (maybe a bit more depending on lift).

Regardless of lift, you need to be careful increasing tire width, because with stock rims you will rub on the inside. If you get rims with more backspace, you can go wider.

Ask around to see what the widest people with stock rims can get away with. I am guessing it is around 270. As for height, a 75 (ie 270/75) might work... but again, see who is actually doing it first.

 

Thanks for all the help. I just have a couple more. Am I looking for more backspacing or less? I read somewhere else that the stock rim is 16x7 with a 5.5 or so backspacing. I really like the TRD Ivan Stewarts, and they're 16x8 with what came out to a 4.5 or so backspacing. If I were to upgrade to these wheels with a 3" lift, probably OME or Bilsteins/Eibachs, what tire could I run?

Thanks again
Scott

 

Backspacing is the distance from deep/inside edge of the rim, to the rim mounting surface.
Terminology can be confusing, because offset measures the similar type of thing, except from the centerline.
For example, the stock rim has 5.5" backspace, and my rims have 4.5" backspace, hence my rims "stick out" 1" further than stock (5.5"-4.5"), giving me that extra inch on the inside.
Downside is when you turn the wheel, the "arc" formed by the outside edge is bigger, which can interfere with your front bumper and mud flaps. That is why you should be careful to understand these things before you buy, or find out who has the exact same rims and similar lift and what works for them. You should research this a bit. Lots of info online, such as: https://www.rsracing.com/tech-wheel.html

I am using 17X8, 6 bolt on 5.5" pattern, with 4.5" backspace, and BFG A/T 275/70R17 tires, which measure approximately 32"X11" when mounted. This fits well with the ARB bumper and removal of front mud flaps.

HOWEVER: You are looking at 16" rims, correct?. Make sure you compare apples and apples. The tire sizes you need to look at are specific to 16" rims.
For example, my 275/70/R17 measures 32" diameter, whereas a 275/70/R16 would measure 1" shorter at 31" diameter, due to the fact 17"rim vs 16" rim.
Remember, the "70" is sidewall height which is 70% of 275mm (0.70 X 275=192mm).

Therefore, the height, starting from the ground, is 192mm of sidewall, plus 17" of rim, plus 192mm of sidewall.
Since 192mm=7.5", you get 7.5"+17"rim+7.5" which equals... you guessed it... 32"

Bottom line... either understand this stuff, or find someone who is using something that works.

Another key point: most aftermarket rims are lugcentric (non-hubcentric), so you need to get splined lug nuts that will properly center the tire for balance. I used Gorilla brand lug nuts, there are several posts on this site regarding this.

Let me know if you have any other questions...

 

OK, I'm running aftermarket rims, more to the fact that I broke one of my factory aluminums than anything. But according to what I've read, you will NOT have any rubbing on the frame with the OEM rims if you go 255/85/16. You WILL have rubbing on the fenders, which a little trimming will fix, but most of the rubbing will come at full stuff and full lock. 285/70 or 75/16 WILL rub.. badly.

 

What is the biggest 285/70/17 on the Market? I know they are all off by a little? Also if i put 295s on my 3 inch lift would i have alot of problems with trimming ect?

 

Once again, this would depend on your backspace. More backspace = more room on the inside, but more interference with your fenders when turning the wheels.

 

Nice

 

so does anyone know the tallest 285s on the market? mts