What keeps me away from putting 35s on the gx (2 Viewers)

[teghogh]

I put 35s on the lc250 the second week of ownership. It rode like a dog stock and rode like a dog with 35s . The engine has no pull despite the impressive torque figures and the top end performance is nonexistent. Today after putting around 1k miles on the gx OT I decided to open it up a bit . My god this engine has lots of pull on the top end. The torque easily pushes you into the seat from 50-70. Quite an exhilarating feeling on a purpose built off-roader. I’ve had plenty of fast vehicles last ones being Audi etron GT , Audi RS5, and jaguar Ftype R with sub 3 seconds 0-60 and haven’t lost perspective on seat of the pants sports cars feel like . This truck is g550 esq in the way it pulls on the top end and in a completely different class than the lc250 in acceleration and handling , 3rd and forth gear pulls in manual sport mode from 40-70 is truly impressive . I can live with the mpg loss going with 35 tires but I’m afraid they will significantly impact the thrill factor when it comes up on ramp pulls that puts a smile on my face every time I floor the throttle.
If the hybrid option shares the same drivetrain as the lx I’d have to seriously consider trading in for extra 150 ft lb of torque

 

[S SUBERI]

Nice write up. And to think I almost got the LC

 

[chris.gio]

Also can make it look like a roller skate

 

[Bluegill]

The Lexus GX550 has plenty of power to push 35s. The power and the 10-speed make it no big deal.

 

[teghogh]

The Lexus GX550 has plenty of power to push 35s. The power and the 10-speed make it no big deal.

I know it does but it is still a comprise for spirited driving which gx excels at compared to the lc. Either way the lc I never go above 3k rpm due to lack of power and trashy engine noise but the gx is quite enjoyable when you smash the throttle and I’m somewhat afraid to miss that going to a larger tires

 

[teghogh]

The Lexus GX550 has plenty of power to push 35s. The power and the 10-speed make it no big deal.

The Toyo open country at3s 35s are somewhat light for a 35x12.5 but still 20 lb more per wheel that stock setup . The total 80lb additional unsprung weight is ~ equal to carrying 400 lb of additional static load. In addition, the larger tires effectively reduce the effective drive ratio by about 10 percent going from 32 to 34 inch tire which means 10 percent torque reduction at the wheel, so total acceleration based on additional weight and torque reduction is 16 percent and that is 100 percent noticeable for spirited driving which. For normal day to day that you are using 30-50 percent of output power it is not noticeable .
I had a Volvo xc90 plug in hybrid that could run on electric motor only with 80hp, and 170 tq and it was completely adequate for daily driving. When the engine kicked in the total available power was 450hp/ 525 tq but was never needed
Ofcourse 35s have upside in terms of ground clearance which is undeniably useful if you offroad regularly and they look fantastic . I sure hope I don’t find my gx parked next to an example with 35s on because it would make it really hard to resist the temptation to upsize

 

[Bluegill]

As a scientist, I too like to run the numbers and over-analyze everything.

My stock 2024 GX550 Overtrail tires were the standard 265/70/R18 Toyo Open Country AT3s with the SL load rating which are advertised as 43 lbs each on Toyo's website. The internet rumors are that Lexus had "special" AT3s made which seem to be weaker than normal AT3s so they may indeed be lighter in weight too. I can't confirm this and I've seen no data on weight. I should have weighed one when I had them sitting in my garage for almost a year.

My 35s are Toyo Open Country AT3s with a C load rating that come in at 59 lbs each. So 16 lbs heavier (and maybe a bit more if the special AT3s are indeed lighter).

Here is a portion of my tire comparison table for the AT3s:

Then we also have to consider the wheel weight. The stock Overtrail 18" wheel is 32.6 lbs based on internet feedback.

My Method 1703 17X8.5 +35mm offseet 6X5.5 bolt pattern are listed by Method at 27.84 lbs.

So I've saved 4.76 lbs per wheel. Net gain is about 11-12 lbs per corner.

The diameter difference is 1.9 inches which, as you noted, also figures into the equation. I calculated a 7.2% odometer difference after the larger tires which is about equal to your 10% torque reduction estimate.

All this aside, I can tell you from experience that going up to 35s did not make much of a noticeable difference at all.

 

[teghogh]

As a scientist, I too like to run the numbers and over-analyze everything.

My stock 2024 GX550 Overtrail tires were the standard 265/70/R18 Toyo Open Country AT3s with the SL load rating which are advertised as 43 lbs each on Toyo's website. The internet rumors are that Lexus had "special" AT3s made which seem to be weaker than normal AT3s so they may indeed be lighter in weight too. I can't confirm this and I've seen no data on weight. I should have weighed one when I had them sitting in my garage for almost a year.

My 35s are Toyo Open Country AT3s with a C load rating that come in at 59 lbs each. So 16 lbs heavier (and maybe a bit more if the special AT3s are indeed lighter).

Here is a portion of my tire comparison table for the AT3s:

View attachment 13824

Then we also have to consider the wheel weight. The stock Overtrail 18" wheel is 32.6 lbs based on internet feedback.

My Method 1703 17X8.5 +35mm offseet 6X5.5 bolt pattern are listed by Method at 27.84 lbs.

So I've saved 4.76 lbs per wheel. Net gain is about 11-12 lbs per corner.

The diameter difference is 1.9 inches which, as you noted, also figures into the equation. I calculated a 7.2% odometer difference after the larger tires which is about equal to your 10% torque reduction estimate.

All this aside, I can tell you from experience that going up to 35s did not make much of a noticeable difference at all.

Thanks bluegill
Per min 18 of C&D gx ot video the stock wheels and tires weigh 66lb compared to your setup at 86lb. The lightest 17 inch setup with reasonable cost is method 705s same offset as 703s . At 25lb they are 3 pounds lighter than 703. And Goodyear territory MT 35x315 17 at 52lb. The MTs now come in RT spec which are more street oriented due to thread design that mimics the ko2s resulting in much quieter road manners but the same weight savings

 

[nonamex]

The Overtrail wheel/tire weight is 66.2 lbs (27 lbs for wheel and 39 lbs for tire).

For this reason I’m going to Volk wheels and eventually Mickey Thompson Baja AT SL 33” tires. The weight for this combo is 68 lbs (19 wheel + 48 tire).

Just need to reduce weight wherever possible.

 

[Bluegill]

If that’s true then they really trimmed down the AT3 for the GX550 stock application. When you go to replace your stock tires, you’ll be adding on 4 lbs per corner. The estimate I saw for the stock wheel was 32.6 lbs (someone on this forum weighed one). Perhaps they were wrong. No matter either way, the truck has to carry it, I don’t. And the truck doesn’t seem to mind.

 

[rovensail]

As a scientist, I too like to run the numbers and over-analyze everything.

My stock 2024 GX550 Overtrail tires were the standard 265/70/R18 Toyo Open Country AT3s with the SL load rating which are advertised as 43 lbs each on Toyo's website. The internet rumors are that Lexus had "special" AT3s made which seem to be weaker than normal AT3s so they may indeed be lighter in weight too. I can't confirm this and I've seen no data on weight. I should have weighed one when I had them sitting in my garage for almost a year.

My 35s are Toyo Open Country AT3s with a C load rating that come in at 59 lbs each. So 16 lbs heavier (and maybe a bit more if the special AT3s are indeed lighter).

Here is a portion of my tire comparison table for the AT3s:

View attachment 13824

Then we also have to consider the wheel weight. The stock Overtrail 18" wheel is 32.6 lbs based on internet feedback.

My Method 1703 17X8.5 +35mm offseet 6X5.5 bolt pattern are listed by Method at 27.84 lbs.

So I've saved 4.76 lbs per wheel. Net gain is about 11-12 lbs per corner.

The diameter difference is 1.9 inches which, as you noted, also figures into the equation. I calculated a 7.2% odometer difference after the larger tires which is about equal to your 10% torque reduction estimate.

All this aside, I can tell you from experience that going up to 35s did not make much of a noticeable difference at all.

Same tires, on factories, and same results. No noticeable differences.

 

[newlyn]

The internet rumors are that Lexus had "special" AT3s made which seem to be weaker than normal AT3s so they may indeed be lighter in weight too. I can't confirm this and I've seen no data on weight. I should have weighed one when I had them sitting in my garage for almost a year.

My 35s are Toyo Open Country AT3s with a C load rating that come in at 59 lbs each. So 16 lbs heavier (and maybe a bit more if the special AT3s are indeed lighter).

Here is a portion of my tire comparison table for the AT3s:

I've noticed that the retail SL Toyo AT3's are T rated (118 mph) whereas the Lexus OEM ones are H rated (130 mph). I haven;t seen a retail Toyo AT3 with an H rating on the Toyo website, but my OEM tires say it right on the side.