LC 250 Premium — Persistent Highway Instability After Wheel/Tire Swap — Seeking Diagnosis

[alefer5]

Hello everyone,

In December 2025 I replaced my 2013 GX 460 with a new 2026 LC 250 Premium. Despite the premium package, my vehicle came with 18" wheels stock. After a few trips into California's Eastern Sierra I quickly identified the stock tires as a limiting factor for my use case.

The Setup
At approximately 2,800 miles I made the following changes:

• Wheels: GX 550 Overtrail OEM wheels sourced from eBay (takeoffs) — 18" x 7.5", +50 mm offset (stock LC 250 offset is +60mm)
• Tires: Falken Wildpeak AT4W 275/70/18 Load Range E
• Pressure: Running 40-42 PSI cold per this load-based calculator
• Alignment: Performed by a reputable LC/GX specialist shop in SoCal shortly after the swap — report attached

The Problem
Despite the alignment, the vehicle drives poorly on highway — specifically:

• Constant rightward drift requiring persistent counter-steer correction
• Tramlining and left-right hunting on grooved pavement
• Generally unsettled, exhausting highway feel — not harsh, just never planted

What I've Done

1. First America's Tire visit: Road force measured left front at 39 lbs — significantly out of spec. Match mounted and rebalanced. No meaningful improvement.

1. Second America's Tire visit: Discovered the first shop had performed road force balancing at the factory door sticker pressure of 33 PSI rather than the correct E load pressure of 40-42 PSI — compromising the accuracy of the first measurement entirely. Rebalanced at correct pressure. Final road force values across all four corners came in at 16-18 lbs — within spec.

1. Front tire swap left-to-right: Performed as a conicity diagnostic. Pull did not clearly reverse — suggesting conicity alone is not the primary cause.

Current Status
Nearly 6,000 miles on the car (3,000 on the tires). All four corners road force balanced at correct pressure to 16-18 lbs. Alignment confirmed clean. Pull and highway instability persist.

My Theories — Seeking Input
A few hypotheses I'm working through:

• Scrub radius change: GX 550 OT wheels at +50mm vs stock +60mm — 10 mm outward shift increasing scrub radius. Could this be notable enough to affect highway tracking?
• Rear thrust angle: Alignment shows 0.13° rear thrust angle with unequal rear toe (0.26° left / 0.00° right) — rear toe is non-adjustable on this platform. Could this be contributing to the rightward bias?
• Load Range E on this platform: Multiple forum members have noted the LC 250's EPS doesn't interact well with stiff E load sidewalls. Is this a known issue? However, I'm seeing many people suggest E-rated K03s.
• AT4W specifically: Is this tire simply too aggressive for the LC 250's EPS and suspension tune? Several owners seem to have better experiences with KO3 or Toyo AT3 in the same size.
• Suspension: Would underdamped stock suspension be contributing to the unsettled highway feel this significantly? Would a MT-64 or BP-51 swap (no / minimal lift) help here?

Alignment report attached. Any input from those who've navigated similar issues appreciated — this is supposed to be my do-anything daily driver and I need more confidence on the highway before committing to longer overlanding trips.

Thanks in advance.

 

[cruiserloco]

Put the original wheels and tires back on. If the problem goes away then you know...

 

[Ironman4x4America]

It looks like you've been very thorough with checking alignment which is good to do. I really think its the tires. I agree with the post above, that if you swapped back and the symptom goes away then that's the answer.

You went with a great tire but I think the Load Range E is what's killing you. That tire is rated for 3/4 and 1 ton trucks with a weight capacity north of 3500lbs per tire! Your LC250 wet is maybe 5400lbs with a GVWR of 6725lbs. That's a weight range of 1350-1680lbs that each tire needs to support. Your tires are looking for at least 2000lbs more weight per tire to ride properly! Go with a tire that is rated for the weight of your vehicle and what it is carrying, such as a load range C tire. Your door vin sticker will be referencing a C tire for correct pressures.

Don't fall for the 10 ply sales pitch that tire shops drop. They want to make $$$ and 10-plys are substantially more expensive than a 6-ply. Sure they are less prone to get a sidewall cut because of the extra plys but it is so rare to have it happen, especially on something that is daily driven. Tire shops are happy to sell what ever to make the most $$$, not necessarily what's right.

The tire is the first part of your suspension. Think of it like a spring. If the spring is too stiff because of not enough weight on it then the ride will be terrible, same goes for tires. These tires would feel great on a Super Duty, you just don't have the weight to allow the tire to conform to the road surface. These will have an extremely harsher feel if you run them at the correct 80 psi, transmit much more road bumps and vibration, make your acceleration and braking feel less effective, and negatively effect fuel. Your suspension will be working harder to control those tires resulting in poorer performance, and more long term wear on components and bearings.

"E" tires are typically 10-15 pounds heavier per tire than "C" tires. This increased weight (unsprung weight) requires more energy to move, lowering fuel economy by 1-2 MPG and making the vehicle feel sluggish. You have so much more rotating mass in that tire to speed up and slow down with a vehicle that doesn't have the engine, drivetrain, or brakes to sustain that. Load Range E tires are designed to carry heavy loads at higher pressures like 80 PSI. When used on a light SUV or truck that isn't loaded, they have a smaller, less compliant footprint, which can reduce braking effectiveness and worsen handling. I think the smaller contact patch to the road is contributing to your drift, wandering, and unsettled feeling you are experiencing.

Off road the problems will persist. You will experience less tire conforming to the terrain when you are aired down because the side walls are waaaaay too stiff! They wont flex and contour to uneven surfaces properly. And again, they want 3500+lbs on each tire to get it to flex. Sure they are more durable but not the right tool for the job.

I really think if you stick the a Load Range C tire that is rated for how much your vehicle weighs then you will be in great shape. An E is just not the right tire.

Hope this helps!

-Miller

 

[Loober]

I agree with the above regarding Load Range C tires, that's what I run on mine with very good results. Having said that, I don't believe that is the cause of your problems. If the road manners are truly as egregious as you claim, there is something more apparent going on, a few hundreds on the alignment specs or suspension nuances would not cause that. Likely some inherent flaw in the tire or wheel, if that's all that was changed. As others said, best is to put a different set on, doesn't have to be the OEM, and see if the problem persists, go from there.

 

[Rednexus]

I agree that E-load tires at 42 psi are not going to ride well at all. Those are also very heavy tires at 60# each, so you have a significant increase in rotating mass that will negatively impact acceleration, braking, fuel economy, and ride (after all, the suspension has more mass to damp now). I personally run SL-rated tires (also Wildpeak AT4Ws) on my rig and have done lots of wheeling, towing (right up to the max rating), and highway use. They also ride very well at 32 psi.

It looks like there are only a few SL rated tires available in 275/70/18, but many C-rated tires are available. I'd suggest offloading your E-rated AT4Ws and switching to something in a SL or C load. I'm not sure if you can run 17" wheels on a LC250 or not, but if you could and were open to getting different wheels, that would open up the 285/70R17 size which has many SL-rated tires available. Some, like the Toyo Open Country, are <50# in that size and will ride very nicely. C-rated tires will be better than E-rated tires but IMO still too stiff and heavy for a rig that sees a lot of daily-driving use.

 

[Dr T]

Air down to 33-35 psi and give it a go. 40-42 with load range E will be very harsh. When I run the numbers on the tire pressure calculator you referenced I get a recommendation of 35 psi for a load capacity of 2070lbs. I’m running Pirelli Scorpion XTM AT load range SL and love them on and off-road. Running 32PSI

 

[NC 888]

I always run E rated tire on my Gx and lc 250 no problem. Currently running at4w 275 70 18 e load , track straight on the highway 70-80 miles/hr. Something might be wrong with the tires or wheels or balancing .

 

[dms]

Have the wheels been checked to be certain that there is not any run-out. I had some steel wheels purchased new that caused the same problem. In my case, when the rim was attached to the actual wheel it was not on perfectly straight.

 

[Tex68w]

We have 275/70/18 Toyo RT Trails on our GX550 OT for nearly 5K miles now with no balance or handling issues to report. I run them at 36 psi.