ZR2 Oversize Tires Thread

[wutang61]

FWIW the placard on my 2022 said 35 psi while the placard on my new 2025 says 38 psi.

Based on what’s written on my 22.
YMMV but from my experience I don’t recommend this. E’s need pressure.

 

[DNZR2]

View attachment 18018
Based on what’s written on my 22.
YMMV but from my experience I don’t recommend this. E’s need pressure.

Just thought it interesting that GM changed their recommendation on basically the same truck and tire setup.

 

[AXE]

FWIW the placard on my 2022 said 35 psi while the placard on my new 2025 says 38 psi.

Interesting, cause my 22 says 38......I think.

I run my Toyo RT Trails Load Range E 10 PR at 37-38.psi cold and they run up to 40+ psi warm and they feel pretty good.

 

[AXE]

View attachment 18018
Based on what’s written on my 22.
YMMV but from my experience I don’t recommend this. E’s need pressure.

I got a strange number when I punched mine in too. Max load on the Toyo RT Trails says 4080 psi at 80 psi. They feel sluggish under 37-38 cold.

 

[GATORB8]

I got a strange number when I punched mine in too. Max load on the Toyo RT Trails says 4080 psi at 80 psi. They feel sluggish under 37-38 cold.

Looks like the half ton has a GVW of 7,300 lbs. At 35 psi the tire load rating is 9,180 lbs. While you could drop a little lower for comfort and still have coverage for load if you really wanted too, the calculator is normally a good starting point. It is taking the load charts, calculating the OEM load and converting it to the load table for your new size. OEM pressure is normally a balance of comfort and efficiency.

A chalk test of tread contact is normally a good thing to do, and the calculator does recommend that, even tread contact will maximize the miles you can get out of the tires. I've found I normally see a decent tread pattern at the calculator, resulting in solid wear.

After that it's up to your preference, the lower the pressure the softer the ride, the higher the pressure the firmer the ride. When you get outside the sweet range for tread contact on the low range you can get stability issues and outer tread wear, when you go higher, contact patch shrinks to the crown of the tire, giving less drag and normally better MPG, but tends to center wear the tire.

Changing from the stock tires to a wider, more aggressive tire will feel more drag, because that's increased traction is the point of the wider tire.

A well damped, compliant, independent suspension reduces the need to use tires as the cushion on road. As nice as the 2500 suspension, It's not real surprising that upping the pressure doesn't make the half ton ride harshly and helps with efficiency and stability.

 

[AXE]

I run mine from 12 to 80 psi. I usually start with mfg recommendations and then go up and down +3 and decide where to run them.

I've never had a bad tire on a vehicle due to wear. I've never changed a tire on the road side. I've plugged a couple from screws/nails.

My camper likes to chew through them, but it should have been a triple axle. I had to change a tire on that once as the tread separated just as I got to my campsite.

 

[amateurhour]

Updating with the new setup:
22 1500 ZR2

-35/11.5r17 Falken Wildpeak AT4W
-17x9 Method 305 +0 offset
-Peak leveling kit
-Same trimming as before

 

[Chevyman2022]

Got my new shoes on. I went with stock tire size 275/70r18 Falken wildpeaks 4w. 1 1/2” spacers all around. Had to trim the inner weather tech mudflaps about 3” square.

 

[OC ZR2]

Toyo Open Country RT Trail 285/75-17 with Black Rhino 17’s, 8.5 and 0 offset. No suspension mods, totally stock. No rubbing full lock either way. Haven’t off-roaded yet, may touch, but if it does, very slight mod needed. Advertised specs say 33.9 diameter tire. Running 40ish on psi so far

 

[DNZR2]

Nice looking setup

 

[OC ZR2]

Thx, I needed to keep it tighter with the trails we hit out here, didn't want them poking out too much.

 

[LSnTX]

@OC ZR2 nice
Load range E?

 

[OC ZR2]

Sorry, yes E. Dropped to 38 psi, seems good.

 

[IrishRedFish]

Looks Great! Nice truck color too!

 

[OC ZR2]

Thx buddy

 

[OC ZR2]

Update on the Toyo's I'm now running. Able to put them through some moderate off-roading, climbing, rocks, ruts and such. Very happy, aired down to 23 rear and 21 front. Very minor rubbing on full lock left and right, rear part of front wheel well, not enough to cut or modify.

 

[MotorCitySteel]

Figure it’s time to a make a dedicated thread for those who have increased tire size or changed wheel tire combinations.

Format it so Google can find it so we can increase traffic to the site and maximize information available to everyone.

Tire size (xxx/xxRxx or floatation size.)
Wheel (stock or A/M with width and offset specifications or spacers if applicable)
Suspension modifications
Any trimming performed (if so list what was modified)
Please note any Tire-Body contact observations.

Decent photos of the setup for others to navigate choices themselves for their own trucks. Try to keep back and forth regarding users combinations to PM’s to keep the thread clean.

Seems like a good idea to me. Have at it.

Im running a 305/70 18 Goodyear Territory MT. New takeoffs from a Silverado HD ZR2.
Stock wheels 1.5" wheel spacers. Peak upper and lower 2.25" lift, Dirt King UCAs. Trimming to bumper and front/ rear wheel well liners. Rubbing at Crash bar, slight rub at lock only.

 

[OC ZR2]

Looks great! Good info

 

[Zips88]

Toyo Open Country RT Trail 285/75-17 with Black Rhino 17’s, 8.5 and 0 offset. No suspension mods, totally stock. No rubbing full lock either way. Haven’t off-roaded yet, may touch, but if it does, very slight mod needed. Advertised specs say 33.9 diameter tire. Running 40ish on psi so far View attachment 22487View attachment 22488View attachment 22489View attachment 22490View attachment 22491View attachment 22492

Sharp! Does anyone happen to have Toyo tires on their ZR2 in OE stock size 275/70R/18? If so, can you post a picture?

 

[AXE]

Sharp! Does anyone happen to have Toyo tires on their ZR2 in OE stock size 275/70R/18? If so, can you post a picture?

I think that would look pretty much the same as the OEM Goodyear Territory MTs. They are similar design to Toyo AT3s and RT Trails. You can compare the dimension specs on their respective websites.