Going Bigger - 5th Gen Tire Fitment Guide

[@jrfordlandia]

The problem is that every 4Runner is a bit different, so even if you had measured before, you wouldn't necessarily know for sure if your adjustments for caster would have enough left to help. So it really is one of those situations where you kinda have to just try and see if it fits.

To add another wrinkle - the higher you lift, the less caster you have. It's just the way the geometry of the A-arms work where the upper control arm pivots at an angle compared to the lower one. So... the lift height will have an effect on the measured caster angle even if the lower control arms is all the way forward. For example at stock height the same LCA settings for 4* of caster would only result in about 1.5-2* of caster at 3" lift. What that means for this situation is that you can't necessarily just assume that if you're set at 2* of caster now, you can go to 4. There might not be enough adjustment left. And the caster angle doesn't really directly translate to whether the spindle is adjusted forward. It can be all the way forward at 2* of caster in some cases and in others that would give 5* of caster.

That's why most lifts end up with replace upper control arms. They move the upper ball joint to get back the lost caster from the lift. BUT... they do it by moving the upper joint to the rear - effectively removing some of your clearance at the body mount area. So the need for upper control arms to have a good allignment can end up reducing your body clearance where you want it.

All of those factors plus a very close fit result in a lot of confusion over whether a certain tire size fits or not. And that's kinda why we always end up with the answer being - maybe, maybe not - depends on your vehicle. How much lift, what control arms, what wheel offset, what tire size, and even what tire tread pattern - some are just a bit wider than others.

I think you can pretty safely assume on most 4Runners that 285/70/17's will fit with trimming the front bumper and removing the mud flaps as long as your wheels are stock offset. Wider offset causes problems and so do larger tires. You can pretty safely also assume that 285/75/17 being 1.3" taller than 285/70/17's will not fit in almost any instance without cutting the body mount. On mine it was not close to fitting. Other sizes like 255/80/17 being narrow tend to fit better than wider ones, so you could have a bit wider stance on the wheels.

And - finally, I think we all dream of a day when we can just slap 35's on without a lift or rubbing like the JL wranglers. Come on Mr. T - give us some tire clearance in the next edition!

. Really appreciate that!

 

[Teenadie]

Size suggestion

What is a good upgrade tire size for 2015 stock 4Runner? Brand of tire? Want more adventuresome look.

Currently have 265/70 17

Thank you!

 

[2016 4Runner SR5]

What is a good upgrade tire size for 2015 stock 4Runner? Brand of tire? Want more adventuresome look.

Currently have 265/70 17

Thank you!

The stock 265 is a tiny version of an actual 265 Put a nice all terrain 265 or 275 under it ad you will love how it looks. Keep in mind you will very likely need to do a little plastic trimming if you go up to a 275 You may even need trimming with a 265 depending on the tire.

 

[PaulH]

What is a good upgrade tire size for 2015 stock 4Runner? Brand of tire? Want more adventuresome look.

Currently have 265/70 17

Thank you!

Here's a shot of my '19 TRD ORP with Falken Wildpeak AT/3Ws in 275/70R16 275/70R17. I did have some slight rubbing on the mud flaps and still do on the front fender liner. Replaced the mudflaps with a set that don't have the big hump in them and will be doing the fender liner mode to move it forward a bit.

 

[DeltaWhiskey]

Here's a shot of my '19 TRD ORP with Falken Wildpeak AT/3Ws in 275/70R16. I did have some slight rubbing on the mud flaps and still do on the front fender liner. Replaced the mudflaps with a set that don't have the big hump in them and will be doing the fender liner mode to move it forward a bit.

Did you mean 275/70/17?

 

[PaulH]

Did you mean 275/70/17?

Yes, I did mean 275/70R17. My fat fingers got me!

 

[krazywake]

Just for anyone's future reference... with a 2.5" Icon suspension lift, was able to fit a less common 275/70/r18 KO2s (33.16") after removing the front mud flaps and easy front fender trimming mod. No wheel spacers. Probably wouldn't fit without the lift, but haven't seen many people running this size and decided to take a chance.

 

[pberry]

Anyone running K02 in 275/65/17? Lift install is scheduled for tomorrow and second guessing if I should have gone the 275/70 route. Lift is 5100’s all around, front set at 1.75 with Bilstien B12 special (p/n 36-281817) for 1” lift in rear.

 

[2016 4Runner SR5]

Anyone running K02 in 275/65/17? Lift install is scheduled for tomorrow and second guessing if I should have gone the 275/70 route. Lift is 5100’s all around, front set at 1.75 with Bilstien B12 special (p/n 36-281817) for 1” lift in rear.

Why not go 285/70?

 

[pberry]

Main reason is I was worried about the possibility of having to do BMC. I Figured the 285 would be cutting it to close for comfort. I searched high and low and can’t find anyone running 275/65 size. 99% are running 275/70

 

[2016 4Runner SR5]

Main reason is I was worried about the possibility of having to do BMC. I Figured the 285 would be cutting it to close for comfort. I searched high and low and can’t find anyone running 275/65 size. 99% are running 275/70

What wheels are you running? There is no reason to ever have to do a BMC if you select the right wheels. I was running 285/70/17 completely stock, no lift, no BMC needed. All I did is the fender liner mod which you will have to do either way.

 

[pberry]

What wheels are you running? There is no reason to ever have to do a BMC if you select the right wheels. I was running 285/70/17 completely stock, no lift, no BMC needed. All I did is the fender liner mod which you will have to do either way.

I meant to say fender liner. Trying to avoid having to do that, if I can. I have a 2016 trail. Planning on keeping stock trail wheels.

My main question is are the 275/65 the right choice or should I go with 275/70? I can’t find any photos with someone running 275/65 K02’s tires with a 1.75/1 lift.

 

[2016 4Runner SR5]

I meant to say fender liner. Trying to avoid having to do that, if I can. I have a 2016 trail. Planning on keeping stock trail wheels.

My main question is are the 275/65 the right choice or should I go with 275/70? I can’t find any photos with someone running 275/65 K02’s tires with a 1.75/1 lift.

Fender liner mod is almost guaranteed. The Pro is trimmed at the port even with the stock size tires because they rub. As for your tire selection, there is really no definitive answer since every truck is a little different. I would bet $ that you will do a fender liner mod though.

 

[Bat4runner]

In case anyone is wondering. I have a 2020 SR5 premium with 2.5/1.5 leveling kit. I just got 275/70/17 BFG KO2 installed on a 17x9 wheel with 0 offset and 4.75 backspace.

Rubbing on the front fender liner and part of the corner of the front bumper on full lock on both driver and passenger side. Rubs majorly in reverse, but only sometimes when in drive. I would've thought for sure it wouldn't rub with 275s but unfortunately it did even with the lift. I went ahead and had to cut part of the fender liner and shave a bit of the front bumper.

FYI incase anyone is wondering

 

[2016 4Runner SR5]

In case anyone is wondering. I have a 2020 SR5 premium with 2.5/1.5 leveling kit. I just got 275/70/17 BFG KO2 installed on a 17x9 wheel with 0 offset and 4.75 backspace.

Rubbing on the front fender liner and part of the corner of the front bumper on full lock on both driver and passenger side. Rubs majorly in reverse, but only sometimes when in drive. I would've thought for sure it wouldn't rub with 275s but unfortunately it did even with the lift. I went ahead and had to cut part of the fender liner and shave a bit of the front bumper.

FYI incase anyone is wondering

Lift makes very little difference with IFS Those tires fit stock and would have rubbed in the exact same places either way. I ran 285/70/17 with stock suspension and rubbed less than you do. I removed the front mud flaps and did a fender liner mod and there was zero rubbing. Do the fender liner mod and you'll be good to go.

 

[Bat4runner]

Lift makes very little difference with IFS Those tires fit stock and would have rubbed in the exact same places either way. I ran 285/70/17 with stock suspension and rubbed less than you do. I removed the front mud flaps and did a fender liner mod and there was zero rubbing. Do the fender liner mod and you'll be good to go.

Had to do the fender liner mod and trim bit of the front bumper off. Got it to work though!

 

[angerbot]

What wheels are you running? There is no reason to ever have to do a BMC if you select the right wheels. I was running 285/70/17 completely stock, no lift, no BMC needed. All I did is the fender liner mod which you will have to do either way.

Looks great! Do your fronts not eat the fenders at full compression though? It looks tight.

 

[kevingoleta]

Anyone running K02 in 275/65/17? Lift install is scheduled for tomorrow and second guessing if I should have gone the 275/70 route. Lift is 5100’s all around, front set at 1.75 with Bilstien B12 special (p/n 36-281817) for 1” lift in rear.

I have a 2.5-3″ lift on my 2016 Trail Edition with SPC UPA’s. I just got 285/70/17 KO2’s installed and have zero rub.

I did some of the fender liner mods. Basically just drilled 1 new hole in the liner and moved both up an inch or 2. I trimmed some of the mud flap where it was kinda poking out into the wheel well and wah-la! I’m good to go. Have only driven it for 10-20 miles so far and nothing off road, but I’ve pinned the wheel in both L-R directions, forward and reverse and haven’t heard anything. I’m stoked I didn’t need to cut any of the actual body. Most cutting was just to the mudflaps. (All this was done in just the front wheel wells, nothing in the back)

 

[Motory]

For those of you with 295s or bigger, what did you do with the pinch tab near the rocker panel end cap and the bolt holding the fender liner to the sheetmetal? I seem to be rubbing on both. Did you just cut it all until you have clearance?

 

[GX4SEVEND]

I cut mine. There’s part of the fender tab still in the way and haven’t decided what I’ll do with that yet.


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