285/75-17 with 3" OME lift and icon UCA **HELP**

[Mikedezzy]

I cannot find a certain answer about this size tire. :violin: Please help with my specific set up.

I have a 3" OME lift with Icon upper control arms.

I was sitting at 38" up front and 40" in the rear (from the ground) until I added a toytec 3/8" top spacer with my lift for a little extra lift up front. I am now sitting at 38 3/4" up front now.

My front fender is already trimmed heavily & I am currently running 285/70-17 ...

But I want to step up to a 285/75-17.

Can anyone confirm if these will work. I am getting the tires for about $200 a piece and i am about ready to pull the trigger.

 

[Javelin]

Have you done the BMC?

 

[wfo9]

BMC is 100% mandatory and I think you will have major rub in the rear without an extended bump stop or some cutting (or an aftermarket rear bumper)...

I have a similar sized tire and I'm still fitting them. I can barely clear the rear with a 3" bump stop extension and Icon Long travel shocks.

The front looks pretty good so far with the wheel straight, but I still need to do the body mount chop and get out on the trail to fully flex it in all positions....

It is very doable, just requires some adjustments.... You also need the correct rim 8" with a 0 - 10 (negative offset is best). Shoot for about 4.5-4.1" backspacing

 

[adam2562]

im curious too as to what it takes, i wanna go to a 75 also on my 285's

 

[Mikedezzy]

Have you done the BMC?

No i have not done the BMC. I read on a couple of thread it wasnt necessary with aftermarket UCA...

Or at least i thought i had..

Is there a write up on BMC anywhere.. I saw them on the 4th gen but not one on the 5g.

 

[marshal]

No i have not done the BMC. I read on a couple of thread it wasnt necessary with aftermarket UCA...

Or at least i thought i had..

Is there a write up on BMC anywhere.. I saw them on the 4th gen but not one on the 5g.

That's not correct at all

75s require the BMC, heavy liner trimming or removal and appropriate backspacing to clear the upper control arm mount. Depending on what brand 75s you get (some are larger then others) you may need to clearance the fender mount

 

[Mikedezzy]

Thank you Marshal!! I found a few pictures on the Body mount chop on hellamatics build thread! http://www.toyota-4runner.org/5th-gen-t4rs/128849-hellamatic-build-thread.html

Helped out big time.. Does everyone weld on the filler on the end or was that him being over thorough?

I have a ton of trimming up front already...

Next question.. Does the back have to have the bump stops if i dont do a ton of flexing. I get offroad maybe 5 times a year for mudding purposes.. not flexing and rock climbing .. IKNOW IKNOW :ak472: me dead.. i just dont have a ton of oppurtunity in texas.. since there is no rain and mostly flat land.. LOL

That's not correct at all

75s require the BMC, heavy liner trimming or removal and appropriate backspacing to clear the upper control arm mount. Depending on what brand 75s you get (some are larger then others) you may need to clearance the fender mount

 

[mikey's2010SR5]

You probably won't need the bumps in the rear. The width of the tire fits fine and I only rub my rear bumper, which will be trimmed before the next trip. Haven't come close to hitting the top of the fender well, but my bumper might be acting as a tire bump, if that makes sense.

As the others said the body mount will need to be cut. I also trimmed the rear fender mount. In the front you will need to trim a lot if you aren't running a front bumper. I think I have cleared all rubbing up front and my next day off will start working on the rear.

They are a great tire size. They look mean on our trucks.

 

[wfo9]

You probably won't need the bumps in the rear. The width of the tire fits fine and I only rub my rear bumper, which will be trimmed before the next trip. Haven't come close to hitting the top of the fender well, but my bumper might be acting as a tire bump, if that makes sense.

As the others said the body mount will need to be cut. I also trimmed the rear fender mount. In the front you will need to trim a lot if you aren't running a front bumper. I think I have cleared all rubbing up front and my next day off will start working on the rear.

They are a great tire size. They look mean on our trucks.

Now that I think about it more the bump stops might not be required. I keep getting myself confused. I have the 3" stops, but my tire ends up a few mm from the bumper at full flex. However, since I have the LT my axle angle is totally different and therefore puts the tire at near the same location it would be with standard travel and no stops. It just gets confusing since there is such a difference between vertical and articulated travel.. with a solid axle. Increasing your down travel actually increases your articulated up travel and the tires size that will fit (even though the vertical up travel is limited by the bump stops). Does that make sense?

And I agree, it is a great looking tire size on these trucks. I put my 33s back on for now (until I have time for the BMC) and it was disappointing.

 

[marshal]

the rear control arms on the 4Runners are so long, your long travel rear shouldn't be affecting your tire placement much. if you have your metal tech arms at a length that places the rear axle in the same location as factory, at full droop the arc path of the rear axle would be 'sucking' it further towards the centerline of the vehicle. since you are running longer bump stops, the reverse of its arc upwards wouldn't be as substantial as a stock units as your rear axle reaches the level apex of the arc, pushing the tire further away from the centerline of the truck.

 

[wfo9]

the rear control arms on the 4Runners are so long, your long travel rear shouldn't be affecting your tire placement much. if you have your metal tech arms at a length that places the rear axle in the same location as factory, at full droop the arc path of the rear axle would be 'sucking' it further towards the centerline of the vehicle. since you are running longer bump stops, the reverse of its arc upwards wouldn't be as substantial as a stock units as your rear axle reaches the level apex of the arc, pushing the tire further away from the centerline of the truck.

I think you are talking about side to side and forward and aft movement (or I'm just lost). I meant the vertical position of the tire to the fender in terms of the larger diameter tire. This is what I was attempting to describe (pardon my quick and dirty diagram). More down travel on one side results in more articulated up travel on the other even though vertical up travel would be much less due to the longer bump stops.

 

[marshal]

Oh okay, yeah - I misunderstood what you were referencing. And yes, you are correct. However, the bump stops contribution is very minimal compared to the extra droop you're getting from the LT shocks.

 

[RaginTxn84]

a good sticky to have saved in your favorites:

http://www.toyota-4runner.org/5th-gen-t4rs/156378-5th-gen-tire-fitment-guide.html#post1550444

BMC would be a must and you'll definitely need to watch for the UCAs rubbing. mike's set up is a good one to go off for the 75s. I think harper has 305s (basically same size) - might have some good pointers on his build.

 

[Javelin]

I have 285/70s and mine rubbed on the BMC haha. You will def need the BMC