Sr5 vs trd

I bought my SR5 in Feb 2016, and the truck had dealer installed 18" tires/ rims on it already.

At 30k plus miles, the tires have normal wear.

As far as the shocks/ suspension wearing out faster, I don't know.

I was never really happy about the 18" rims/ tires, so I bought a good set of 16" steelies.

I plan on switching to these once the 18" tires wear out.

So if the Limited and SR5 share the same suspension, and the Limited has stock 18" tires, what's the difference if I am running 18" on my SR5 now?

Kind of a rhetorical question though.

 

Why would I ignore you? I have a stock sport btw. If I were to put lighter OEM tires (245/75/16) on my Sport. What would the consequences be.

 

True, but everyone is getting way carried away here. The OP asked about running 1 size up. We are not talking about stock tires vs 35” MTs. He will be fine to go up 1 size as long as he doesn’t throw on some super heavy E rated 10 ply tires.

 

Lighter tires. Nothing.

The SR5 comes with 28ish inch tires. He wants to put 32ish inch tires on his truck. It’s not one size.

I had an SR5, and I put the lightest 32” tires on that I could find. It’s just too much of a jump.

 

Rhetorical, but I’ll bite. Rims are much lighter than tires. The tire size has more of an effect than the wheels. Wheels are about 22-28 pounds, tires are up o 50 pounds. An 18” wheel would be laced up with a tire that weighs less. Less rubber so less of an effect.

 

Dude you are so off it’s funny. The size difference is very minor and won’t effect his SR5 suspension. Real numbers for you.

 

Ok. I was off in the tire size. Congrats. Pretty sure you are comparing the size of KO2s in that figure, and different tire manufacturers with different tread patterns do differ in actual size, but I’ll overlook it. The issue is weight. Not tire size.

SR5 wheel is 24 pounds.
Toyo open country h/t tire is 35 pounds.
Total wheel weight on stock configuration is 54 pounds.

TRD pro wheel is 25 pounds.
BFG KO2 E load is 53 pounds.
Total wheel weight of pictured truck is 78 pounds.


Read what I’m saying. I’m saying the weight of the wheels and tires are causing the problem. You are adding in about 50% more weight. While the tire is spinning, it creates way more than 50% more force. The hitachi shocks will handle it, but they will wear out faster. Expect about 6 months, maybe a year, and they will be bouncing! Not completely shot, but they will need to be replaced.

 

Learning suspension is like reading the bible. There is so much to read and when you are done you might only understand it a tiny bit. You might read something ten times before you really get all of it.

So unsprung weight. The heavier your unsprung weight the more force it takes to accelerate it and decelerate it. Now your sprung weight sits above the unsprung weight. When you hit a bump the unsprung weight is forced up towards the sprung weight. You want the sprung weight to stay level and the springs and damping to control the upward movement as well as the downward movement. If the damping and spring rates are correct the person and the sprung weight won’t even feel the bump. But if you have much heavier wheels and tires that added mass and the force required to move it and slow it down will be much higher. What damping and spring rates worked before won’t react the same to a heavier weight (force).

On a street truck will most people notice a difference of heavier unsprung weight? Most likely they will be fighting the added gyroscopic force of the larger diameter tires, wider wheels and tires so even if one notices the weight they are likely going to misdiagnose it as something else.

 

Correct, you will need something more robust. Doesn’t mean you have to go out and spend $3000 on suspension, but an upgrade is needed. I have no idea how the Sport suspension is set up, so I cannot answer that. I have repeatedly heard it is stiffer, but that’s all I know. My uncle has one, but his is on stock tires. My TRD OR shocks are very soft. I don’t know if they were revalved for the 3rd gen or not, but they feel much softer than the second gen OR suspension. But, my dad put those exact tires, that exact size on his truck, and had the same issue with the suspension. He put on 5100s with stock coils and leafs, and it works great. Stock OR suspsion is Bilstein 4600, the Bilstein 5100 is just a little more robust, and very fairly priced.

Bingo.

 

No, good lord it’s like a 4% increase in size, he will not need new struts. OP asked about the stance of those wheels. If he gets those TRD 17” rims he can put a ton of different tire options on that won’t adversely effect the suspension. Hell he could go with a 265/65/17 and it wouldn’t be an increase at all. Hell the 265/70/17 Dynapro ATM I ran was 38lbs on my SCS wheels. Total weight was only a few more then stock.

@jmauvais keeps throwing out random ass info like they are facts. I get that you don’t want to add a ton of weight, but to make a blanket statement about having to swap struts is total BS. There are tons of members here with SR5 trucks who have switched to bigger rims and tires with no issues. Look at the huge pizza cutter thread where members are running 255/85/16 on STOCK suspension. Those tires are like 57lbs and no one is reporting issues at all.

 

And again, check your math. 24 + 35 is not 54. Haha.

 

Clearly you have won this argument on the “autocorrect” technicality. I am not worthy to dispute your claims with no backing using my experience of 5 different vehicles.