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Will 285/70/17 mounted onto the stock 17" FJ alloy rub without a lift or BMC? Or is a lift absolutely necessary?
I have the same question. I want to run the BF Goodrich MT KM2 285/70 17" on fuel octane rims , not sure which width rim to choose. Thanks
I'm running 285/70/17 Nitto Trail Grapplers on stock wheels with a lift with no rub... that said, my alignment is set way off factory. With factory alignment numbers, they rub and full turn, above the horizontal level. I don't think it's possible to run 285s of any tire without a lift... unless you plan on driving in a straight line only.
 

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I'm running 285/70/17 Nitto Trail Grapplers on stock wheels with a lift with no rub... that said, my alignment is set way off factory. With factory alignment numbers, they rub and full turn, above the horizontal level. I don't think it's possible to run 285s of any tire without a lift... unless you plan on driving in a straight line only.
Thank you. I am trying to avoid lifting my FJ as it won't fit in my garage without removing the roof rack.
 

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Discussion Starter #26
kengray I looked up the fuel octane wheels and they only come in one 17" size - 17x8 with -5mm offset which means 285's will fit fine - if you're not going to lift then you'll for sure need to trim the body mount.
 

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Wouldn't it be amazing if tire manufaturers just made the tires the size they should be. -Would definately help a lot of folks.
 

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Wouldn't it be amazing if tire manufaturers just made the tires the size they should be. -Would definately help a lot of folks.
And wheels!
 

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Stock FJ cruiser wheel sizes
16x7.5
17x7.5
6x5.5 (6x139.7 metric) bolt pattern
15mm offset or 4.84" backspace




I'm going to suggest a 3" lift for any of this information to be useful to you.
Get out there and at least buy a rough country/ome/procomp/revtek/icon/toytec 3" lift something anything it will be the biggest benefit offroading you can purchase.
Owners with 6" lift can use lots of this but have a bit more play on how wide they can go because of their higher front end

Right off i'd like to say that wheel sizes are measured from inside the wheel lip. so take a tape measure to a 16x8 wheel and you'll notice from outside to outside both ways it will actually measure around 17x9. inside lip to inside lip is 16x8.
The reason i'm pointing this out first is because of how the 2 methods of backspacing and offest are measured.

Backspacing can always be measured by putting a straight edge against the inside of the wheel and measuring from the inside of the hub.
How to measure backspace(Borrowed from TCao)



To measure Offset you need a metric tape measure. so run the straightedge along the inside of the wheel just like measuring backspace. then take that number and subtract half the wheel width. Your answer can be a negative number of course.

You can always figure out one if you have the other. For example:

16x8 wheel has 4" backspace. the wheel is actually 9 inches wide outside to outside so that means 4.5" would be center or 0mm offset. so you're 1/2" inside of wheel = -13mm offset

16x8 4"backspace -13mm offset
16x8 4.5"backspace 0mm offset
16x8 5"backspace +13mm offset

So the more negative the offset - the more the wheel will stick out of the wheel well.

Where can your tires rub on your FJ and is that a bad thing?
Yes it is bad to rub. If your tires are rubbing under normal driving situation then you can be sure that damage is a possibility on the trail. Thats why figureing out your wheel offset and true tire size are important.
Rubbing spots to watch for -
Body mount
Front wheel wells above body mounts
Upper control arms
Front Sway bar
Rear Wheel wells at the back and top


One quick note about load range letters on tires. I've seen C, D, and E tires on this forum. If you drive your truck at all you probably want a D. This letter is on every single tire on the sidewall and you can ask your retailer before you buy tires to confirm you are getting D load range tires. Some people might disagree on this point but C is too soft for the weight of the FJ. The tread will wear down rapidly plus rock rash and chunking offroading can be accelerated. Now a C load range winter tire would be a fine thing if you have a dedicated set of winter tires. The rubbers softness helps it from getting really hard in cold temperatures and maximaizes traction. E is a little different. Usually E rated tires are for full size 3/4 ton trucks and up. However some of the rigs on this forums are surpassing the weights of 1 ton trucks with all the armor and such on them. You're going to be hard pressed to wreck that hard rubber on rocky trails and you're going to get a lot of miles outta them because the tread is not going to wear fast. You'll also have trouble airing them down for the trails though.


So this thread pertains to wheel and tire fitment and i'll cover some info UCA and body mount chop but any other rubbing or fitment problems will not be covered (such as "my rear 35 inch tires rub the fender at full compression" problems)
If you're looking for a good Body mount chop thread here ya go..
http://www.fjcruiserforums.com/forums/4x4-off-road-tech/137777-different-kind-body-mount-chop.html


16" wheels

So we all know by now that 16 inch wheels are hit or miss with clearing the brakes on the FJ Cruiser. There are the 2 main threads on which 16 inch wheels are proven to fit and you can search through them if your heart is set on 16" wheels, which is a great choice btw. The reason why some fit and some don't usually has to do with the design of the wheel spokes and if they are curved enough or set out far enough to clear the caliper. This is not included in wheel manufacturers measurements so it is always an unknown factor.

Here's the 16" wheels that fit without spacer thread - super cool read...
http://www.fjcruiserforums.com/forums/wheels-tires/110002-post-all-16-rims-fit-without-spacers.html

Basically if you're looking for a 16" wheel, you need a

16x8,
6x5.5 bolt pattern,
and 4" - 4.5" backspace (-15mm to 0mm offset)
or 3.5" backspace ( -30mm offset) could be used for pizza cutters

the research on whether or not they clear the calipers is up to you.


17" wheels

So 17 inch wheels will definatly clear the brakes. Now 17inchers commonly come in different widths. 17x7.5(stock fj size) 17x8 and 17x9 are the most common FJ sizes.

17x8 you want around 4 - 4.5" backspacing ( -15mm to 0mm offset)

17x9 you want around 4.5 - 5" backspacing (-15mm to 0mm offset )notice a trend in the offset???
And i'm going to get into some odd size wheel backspaces and widths in this next section, so read on.


Fitting some Big Bad tires on your new wheels...
Don't worry, offroaders aren't the only ones struggling to fit tires into wheel wells...




So now that we've covered the basic sizes and backspacings. Lets look at fitting some tires to those wheels.


so stock fj cruiser come with 17x7.5 wheels with 265/70R17 Dunlops. (32x11)

so you actually have a wheel that is 8.5" width. And the dunlops measure 10.8" section width. 2.3" difference.

so your tires is bulging out 1.15" on each side of the wheel.


Pizza Cutters - 255/80R17 or 255/85R16 (33x10.5)

When you like pizza cutters then you want a wheels with less backspacing or else wheelspacers. So for a 16x8 or 17x8 wheel you want around 3.5" backspace. Or run wheelspacers with any stock FJ wheels. The good thing about this size is they are usually a 33.3" tire, nice and tall.



Now lets look at 285/70R17 or 285/75R16 (33x11.5)


stock wheel again 17x7.5
this particular 285 measures out to 33" x 11.6"secwidth

so your tire will stick out 11.6-8.5=3.1 divide in half

1.55" on each side.

not too outrageous at all. This a great wheel size for FJ's with a 3" lift and almost garunteed no rubbing while offroading.


Now i want to look at the 295/75R17 Nitto Trail Grappler which has become famous on this forum because of it's seemingly stock fitting ability.

It's a great tire that measures 33.54" diameter x11.97" section width.

so stock 17x7.5 wheel again
11.97-8.5=3.47 divide in half =
1.735" bulge on your wheel

and it's still short enough that it doesn't come into contact right where the arrow's pointed at with the UCA(thanks willaim99740)




305/65R17 or 305/70R16 (33x12.5)

These tire are a little wider than the 285's. Usually people have rubbing problems at the body mount more than anything and you find lots of people with this size tire use wheel spacers and can get away with it because the tire is still not too tall. Should have a wider wheel than stock FJ wheels because of the width and smaller sidewall than a 35.



285/75R17 (34x11.5)
Only nitto and toyo make this size (found bfg AT does too) I think and only in a E compound
It's a nice tall skinny size though and if you have a lot off weight added to your rig (bumpers, skids, roofracks, sliders) you could almost probably run a E range tire. Won't air down for the trails very well though because it's so stiff.


305/70R17 (34x12.5)
This is basically what it says for size, take a look at 35's below to see what you should do to make these fit as they are only really about 1/2 less dimeter.


315/70R17 or 315/75R16 (35x12.5)

Basic rule: if you want to fit big tires keep them as close to the UCA without rubbing as you can. fitting 35" tires on the fj is difficult for a few reasons. Body mount chop is 100% neccesary. aftermarket Upper Control Arms are not 100% neccesary but make life alot easier.


So first off i am running 315/70R17 mickey thompson MTZ's on stock wheels with no spacers and i rub my total chaos UCA's a little bit at full lock, which i have chosen to live with.

so these tire measure 34.6 x 11.9

about the same tire width and sidewall bulge as the trail grapplers with about 1" more overall diameter. And that 1" bigger diameter means the tire sits higher and rubs (at least mine do) on the area pointed out in the william99740 pic.

If i were to throw on a 17x8 wheel with 4.5" backspacing (basically a half inch wider wheel with the half inch sticking out and no more wheel sticking in) that would move my tire out 1/4" inch.

If I would throw on a 17x8 wheel with 4" backspace it would move my tire out 1/2"

All that math to move the tire 1/4"or 1/2" out. which i could because i know theres room at the body mount still because i chopped it aggressively and a 17x8 inch wheel would mean less tire bulge and less risk of popping a bead.


WheelSpacers

sure you can run wheelspacers but the most popular is 1.25" spidertrax here on blue forum. So lets say you got stock wheels again. Basically you're changing your backspace from 4.5" to 3.25"

So your going to have tons of clearance at the UCA.
Your going to have a wider stance and better Center of Gravity.
and if you're only want to run 33" then those are great benifits.

But you're moving the rubbing problem extremly to the body mount. so this will limit how big of a tire you can run. There's no way i can run spidertrax with the 315 mtz's i have about 1/2" at the body mount right now so that means about 3/4" of the tire would be stuffed into that body mount when turning.





In saying all that...

If you read this all i hope you came away learning something. And there will still be questions on fitting tires regardless of how good a fitment guide someone writes or a forum puts together. Anything you don't agree with or want me to change or something you think of let me know.

:cheers:
Chris
Thank you for sharing such quality information. Please excuse me for still asking further questions as I'm new to upgrading and want to make sure I take the right decision as I love my car and so does my little kid.

I want to lift my car and put bigger tires without having to do a BMC job. Can you please tell me what is the max size tires I can use with 16" stock wheels? I was thinking of the BFGs 285/75/16 with an icon or fox 3"lift. Is that a wise choice?




Sent from my iPhone using AutoGuide.com Free App
 

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Discussion Starter #33
If you're running stock 16" toyota wheels I'm sure you'll be ok with 285/75R16 and a 3" lift. If you want to run wheel spacers then you'll run into body mount trouble.
 

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I have 17 X 8 wheels with a 4.5" backspace and -12 offset. When I added the 285/70/17 tires, I had a slight rub at full turn of the wheels. I had a body mount chop done and have not had any problems with rub at all - offroad or on.

I hope this helps the person with the 285/70/17 question.
 

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Discussion Starter #35
^just wondering what "slight rubbing" exactly was. Was it only hitting the body mount cover or would it actually contact the steel body mount itself. You're combo sits out about 1/2" further than a 285 on a stock wheel would as well. Thanks for any and all input guys.
Chris
 

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Alright... totally new to the site (been researching some on here prior to my FJ purchase over the weekend), and it would figure that my very first post would be a lift/tire/wheel question!

In reading the original post, I think I'm good with my original plan:

Stock 17" x 7.5" wheels
Rough Country 3" lift (3" front, 2" rear leveling kit)
Toyota FJ Cruiser Suspension Lift
BF Goodrich Mud Terrain T/A KM2 in 285/70/R17
Mud-Terrain T/A KM2 | BFGoodrich Tires

However, having read this thread, I'm wondering if I can go with:

Stock 17" x 7.5" wheels
Rough Country 3" lift (3" front, 2" rear leveling kit)
Toyota FJ Cruiser Suspension Lift
BF Goodrich Mud Terrain T/A KM2 in 285/75/R17
Mud-Terrain T/A KM2 | BFGoodrich Tires

Same plan, but the 285/75 tire rather than the 285/70 tire (a 34" rather than a 33"). The section widths are almost identical at 11.5" and 11.3", respectively. Will these fit with no rubbing?

And, I guess I have a second question... will the 285/75 look like a pizza cutter? I'm really not into that look, so even if they do fit without rubbing, I'd like some opinions on the height to width look of a 34" x 11.5" tire.

Thanks a bunch! Awesome site, and glad to join it!!!
 

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Discussion Starter #37
285/75R17 works fine.

Hazardhat on this forum has the toyo mt in that size on the stock steelies which have the same specs as stock alloys.17x7.5

 

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Nice post, but I still having a doubt... I can run BFG KM2 285/75/16 on my 16" TRD oem wheels without a lift kit or BMC without any rubbing issues offroading?? I have read a lot and that confuse me more :s Somebody with a sure answer help me
 

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Nice post, but I still having a doubt... I can run BFG KM2 285/75/16 on my 16" TRD oem wheels without a lift kit or BMC without any rubbing issues offroading?? I have read a lot and that confuse me more :s Somebody with a sure answer help me
Yes. You may need to have the caster adjusted forward during alignment as to retain clearance to the body mounts behind the tires.

http://www.fjcruiserforums.com/forums/wheels-tires/143198-285-75-16-bfg-km2-stock-trail-team-pics.html
 

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I spoke with the guy over at Rough Country today, and he told me that 285/75/R17 BFG MT's would rub with the 3" leveling kit RC sells.

He told me to stick with the 285/70/R17...

UGH! Who do I believe?? LOL!
 
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