Drawbacks of upsizing tire size

Unsprung mass is a power killer. Changing ratios does not give you more power, it gives you more torque and there is a big difference. Sure, changing ratios will give you the ability to go up those hills in sixth gear but the penalty is more power is required to do that. The proof is in the reduced efficiency that will cost you every time you fill up.

 

Of course, but I didn't take this hit with the exact same tires on my jeep from an even smaller stock tire.

 

Not the same vehicle, ratios, hp, torque, etc. I'm sure you took a hit though because #physics #newtonsfirstlaw and a whole bunch of other laws that cannot be broken.

 

Shiftsense pro combined with Pedal commander . Will certainly help with your acceleration and shift pattern with larger tire's. It also helps with the MPG's .

 

I attribute it to lack of low end power, where is my jeep was only low end power. Once I put it into he powerband and it gets going just fine.

 

You have "X" amount of horsepower. That's it. No matter where you put it on the curve. If you increase unsprung mass, you require MORE power to accelerate said mass from resting position. If you change ratios, it will change available torque at a certain RPM. Now here's where it gets tricky: If you accelerate that additional mass at a longer rate of time, then you are fine. If you expect to accelerate the additional unsprung mass over the same rate of time as you did before, you lose efficiency.

Bottom line: No matter what you do, increasing unsprung mass (tires, wheels, spacers, etc) will cause a decrease in efficiency due to increased power demand to accelerate that mass over the same rate of time. It's the laws.

 

I think you're misenturpiting what I'm trying to convey.

What I'm trying to say is the increase in tire size and rotational mass has had a profound affect on my ability to pull a hill, more than I anticipated. I need to grab a lower gear to make it up these hills. I'm not trying to accelerate, just maintain speed. My jeep on the other hand made enough power low enough to not need to do this. The lack of power below 3k in these engines really manifest itself once you begin to demand more than required stock.

 

I think I'll just stay with stock size then. No to decide on which one's ....lol.

thank you all for your input

 

I am doing research for new tires as well. The first step in my upgrade was getting SCS F5 wheels that weigh in at 19.0 pounds, stock SR5 wheels weigh 30.2 pounds, so I lost 11 pounds that can add as larger tire weight to stay at an equivalent unsprung wheel/tire weight. Next factor to decide is diameter of new tire that will affect final drive gear ratio for off the line acceleration and highway cruising gearing. I need a reality check that I commute 100 miles a day, 5 days a week on the highway and should avoid 33" LT255/85r16 load E tires that will probably require axle regearing. I should go with an All Terrain 265/75r16 in SL or load C to maintain equivalent off the line acceleration and highway cruising manners.

 

Damn you Tacomaworld. I've watching this thread and finally decided to stay with the stock tire size 265/70 like OP, but now I really like the idea of larger tires + lighter wheels Oh boy my wallet is gonna take a beating!

 

^^^^^^funny stuff . Wallets are way overrated when full . Empty it

 

I give, what is a "Mud Cricket"

 

OK, just in need of new tires pretty soon on my 2nd gen and thought for "appearance" the 285/75R16 vs stock 265 would give the truck a bit more "off roadish" look. I'm not concerned with wear on joints or gas mileage, my ONLY concern would be rubbing when hitting ruts on the fire trails here in the Smokies. Thoughts?

 

Going up one size to a 265/75/16 didnt affect much performance wise. Lost 1mpg but didnt notice a difference in power. Only way that size would rub is if u switched to a wider wheel with more offset There are plenty of tires that size in a non e-load

 

Same with my 2019 Pro. Only lost around 1mpg. Staying stock tires on my 21 just to really test it out and let the truck get through the break in period. Then throw the 265-75-16 wildpeaks back on. They handle wet weather pretty good as well

 

Your truck looks way better Plus I go for smiles per gallon not miles per gallon

 

Thanks for the feedback! Fantasy and Riot can you tell me about road sounds at say 65mph? I occasionally will take a little trip and wonder if I should keep stock tires and wheels for that purpose? (Although it's a pain to swap if you don't have a lift)

 

Fantasy- please tell me about USAF and Lunar rocks, I have a little experience in those areas also.

 

The noise doesn’t bother me. The radio drowns it out and can still have a conversation at 75. But I’ve driven on E rated 35/37s for the last ten years before I got this. I don’t think it’s bad

 

I hope the increase in "unsprung mass" is less than the increase in the "looks" factor.