Tire Pressure and Spare Tire Question for those lifted and running bigger tires

[Black]

When you went with bigger tires how did you determine what tire pressure to run for regular driving?
Are we easily able to change the TMPS warning light values if you are running a different tire pressure.
How big of a spare tire will fit in the spare tire area under the truck?

Will likely end up with the 275/70/18 (33.5x11) or maybe 285/75/17 (33.9x11)
I am only lifting the front 2” so not sure any bigger will fit without trimming which I really don’t feel like doing.

 

[16plati]

When you went with bigger tires how did you determine what tire pressure to run for regular driving?
Are we easily able to change the TMPS warning light values if you are running a different tire pressure.
How big of a spare tire will fit in the spare tire area under the truck?

Will likely end up with the 275/70/18 (33.5x11) or maybe 285/75/17 (33.9x11)
I am only lifting the front 2” so not sure any bigger will fit without trimming which I really don’t feel like doing.

@Black , I have 35/11.50/20s and run 42psi. I contacted nitto and gave them a run down of how I drive it and they recommended 40-42psi. As for the spare, there is very limited room under there for a larger spare. You’d have to cut some stuff out to fit a bigger spare I believe.

2” lift in the front you should be good with 33s, 34x11s might be the max but I’m not sure.

I did Readylift 3/2 and the 35/11.50s fit no rubbing. Any wider in the 35s and they would rub in the UCA

 

[Munkiebunz3]

My setup on 35x12.50r18 +0 likes 47psi. Get sidewalk chalk or tire crayon, do a nice thick coat, drive straight (don't turn wheels at all) and check out the wear after a few dozen feet or 100ft. Gone in center? Lower your psi. Gone on the edges? Raise your psi. One side before the other? Alignment of camber issue.
There's a way to adjust/reset the tpms value but I haven't done it & probably never will since I do a regular check & walk around. It involves some buttons and driving.

 

[16plati]

My setup on 35x12.50r18 +0 likes 47psi. Get sidewalk chalk or tire crayon, do a nice thick coat, drive straight (don't turn wheels at all) and check out the wear after a few dozen feet or 100ft. Gone in center? Lower your psi. Gone on the edges? Raise your psi. One side before the other? Alignment of camber issue.
There's a way to adjust/reset the tpms value but I haven't done it & probably never will since I do a regular check & walk around. It involves some buttons and driving.

Damn I’m jealous u got 12.50s under there. I’m guessing tht front bumper helped with clearance issues?

 

[Black]

What do you feel the advantage to 12.5” tire is?
I decided on a 275/70/18 essentially a 33.5x11
Looking at 305/65/18 essentially a 33.75x12
I was looking at an extra $75 a tire if not more for 18s. Have no desire to even look at what the cost difference for that in 20s would be.
On top of that nearly all the aftermarket upper control arms state anything wider than an 11.5” tire won’t work.
I am going to be 90% roads so not sure on the justification of an extra $300.

 

[16plati]

What do you feel the advantage to 12.5” tire is?
I decided on a 275/70/18 essentially a 33.5x11
Looking at 305/65/18 essentially a 33.75x12
I was looking at an extra $75 a tire if not more for 18s. Have no desire to even look at what the cost difference for that in 20s would be.
On top of that nearly all the aftermarket upper control arms state anything wider than an 11.5” tire won’t work.
I am going to be 90% roads so not sure on the justification of an extra $300.

Wider tire looks better. 3/2 lift really sucks the tires into the wheel well. First pic is 35/11.50/20 on OEM +44

Next pic is same tire/wheel set up with a 1.25” adapter installed. Wider tire (or in my case one pushed out more) definitely looks better

 

[Black]

Thing is I find the top picture much more appealing.

 

[Black]

I was up under the truck yesterday and I am pretty sure a 33.5” spare will fit under there.
It will be close and may have to shift it slightly towards the hitch. I don’t see anything larger fitting.
Need to cut a sheet of cardboard and put it on top of the tire and see what will fit.
Hoping a 33.5 will fit. Then I’ll just grab an 18” steel wheel at the junkyard and buy another tire.
As a tire carrier and aftermarket wheels aren’t going to be for awhile.

 

[16plati]

Thing is I find the top picture much more appealing.

To each his own, they were tucked too far into the wheel well for me. Had no aggressive look until the adapters kicked them out

 

[Adieu]

I was up under the truck yesterday and I am pretty sure a 33.5” spare will fit under there.
It will be close and may have to shift it slightly towards the hitch. I don’t see anything larger fitting.
Need to cut a sheet of cardboard and put it on top of the tire and see what will fit.
Hoping a 33.5 will fit. Then I’ll just grab an 18” steel wheel at the junkyard and buy another tire.
As a tire carrier and aftermarket wheels aren’t going to be for awhile.

You don't NEED to have all 4 wheels identical... 33" or even bog standard 32" will do fine as a spare

 

[lvcjt702]

You don't NEED to have all 4 wheels identical... 33" or even bog standard 32" will do fine as a spare

Unless you blow a tire fourwheeling. Or don't want to swap a front tire to the rear to drive on the highway.

You might want to do a little research on this one.

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[lvcjt702]

I was up under the truck yesterday and I am pretty sure a 33.5” spare will fit under there.
It will be close and may have to shift it slightly towards the hitch. I don’t see anything larger fitting.
Need to cut a sheet of cardboard and put it on top of the tire and see what will fit.
Hoping a 33.5 will fit. Then I’ll just grab an 18” steel wheel at the junkyard and buy another tire.
As a tire carrier and aftermarket wheels aren’t going to be for awhile.

Check https://www.youtube.com/channel/UCNDYWSX_BKUhlufIs28zKBw guy out on YouTube. Kinda long winded. Talks out his ass a bit. But he built a very capable vehicle. He climbs under the truck in one of the vids and shows what needs to be trimmed to fit a 35" spare on a 3rd gen.

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[Adieu]

Unless you blow a tire fourwheeling. Or don't want to swap a front tire to the rear to drive on the highway.

You might want to do a little research on this one.

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Slowrolling through the muck, sand, or rocks, a puny 1.5% size mismatch should matter even less


Ever seen a Mercedes Mclaren SLR on its spare donut? 19" stock wheels... and the spare is like 14" or 15"

Meanwhile a half inch difference doesn't even count as a significant mismatch

 

[Black]

Slowrolling through the muck, sand, or rocks, a puny 1.5% size mismatch should matter even less


Ever seen a Mercedes Mclaren SLR on its spare donut? 19" stock wheels... and the spare is like 14" or 15"

Meanwhile a half inch difference doesn't even count as a significant mismatch

While certainly can be done it is not good practice. Especially if Auto 4wd is going to be a needed utilization.
Add in AdvanceTrac and traction control are all based upon individual wheel speed.
I loose a rear on the highway I don’t feel like swapping 2 tires.
Overall wheel diameter plays a big roll in these electronically controlled vehicle.
Sure I can make sure the oddball is on the front but say I am on a trip and dealing with snow and need auto 4wd not a fun day.

 

[lvcjt702]

Slowrolling through the muck, sand, or rocks, a puny 1.5% size mismatch should matter even less


Ever seen a Mercedes Mclaren SLR on its spare donut? 19" stock wheels... and the spare is like 14" or 15"

Meanwhile a half inch difference doesn't even count as a significant mismatch

Actually, going slow only exacerbates the problem. Heat buildup in your differentials and torque converter is the main worry with what you propose. I'll refer back to my previous comment.

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