Tire size?

[mcrews]

Why dont you try using the search button?
We have discussed this topic 100s of times.
The answer to your question is there, I promise you.
Then, you can post on one of the 100s of threads and ask for some small clarification if you are still confused.

[euromodder]

Originally Posted by SpencersGreenTurd

Anyone have any luck with smaller lighter tires?

That'll mean more rpm, which are going to cost you.

Smaller (lighter) wheels + taller tires is the best option.
Keeps weight down and can still increase the diameter.

Dunno what size you're looking at ?

Continental has a new LRR tire for EVs, 125/80R13
Continental's Conti.eContract tires are all dressed up for electric vehicles

[oil pan 4]

Originally Posted by SpencersGreenTurd

Thanks everyone, is tire stuff is difficult... I m still not sure what's the best route to take...taller tires are heavy and raise car height....

My engineer friend replaced the struts and springs on all 4 corners and raised his ride hight by nearly 2 inches on his 1999 J-body. He says the hit to fuel economy is with in the standard tank to tank deviation and saw no clear hit to fuel economy. The car is driven at least 75% highway driven.
So unless you spend a lot of time above 90mph I don't buy into the ride hight thing.
I went from P235/75R15 tires on my suburban to 31x10.5/R15 load range C tires that were about 15 pounds heavier apeice and nearly 2 inches taller. I expected my fuel milage to go down. It didn't fuel milage went up slightly.

Tire weight isn't going to effect fuel economy on the highway. Each inch of ride hight you go up increases drag by something like 2% or less.

Originally Posted by SpencersGreenTurd

skinner tiers loose load weight and cause more resistance... What I want I can't find. A LRR, light weight, tall, skinny, with a good load weight tire. I don't think one exists!

Taller and wider tires have higher load indexing and have lower rolling resistance than a smaller tire of the same make.
By going to load range C tires on my suburban I picked up 2200lb of load, the tires went from being nearly 90% loaded when the suburban was empty to closer to 50% empty.
Also when you put non LT or lettered load (C, D, E ect.) ranged tire on a truck or SUV its recommended you derate their load rating by 11%.

On a car 1 size taller could give you 100 to 400 pounds of load capacity.

[oil pan 4]

Originally Posted by euromodder

Continental has a new LRR tire for EVs, 125/80R13
Continental's Conti.eContract tires are all dressed up for electric vehicles

If I ever build an electric vehicle its getting 15 inch load range C or LT tires because its going to be heavy.

[davelobi]

I changed tire size on my suburban and fuel economy was way off. I couldn't believe the difference till I realized my speedometer was off and thus my odometer was also off.
If you put larger height (outside diameter) tires on it will take less revolutions to go the same distance. Now your speedometer reads slow. Your odometer now reads less miles traveled per tank. Looks like your gas mileage went down drastically because of the amount of gas used per miles traveled, when you actually travelled more miles than the odometer reads and the effect was much less than you calculated. Clear as mud? When my speedo says 70 mph I'm actually traveling closer to 78 per my gps.

You can have a speedometer shop re-calibrate your speedometer after a tire size change if you want accurate economy readings.

[mcrews]

used the search button:
Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - Search Results

[BrandonMods]

I work as a tire technician and have for the past six years while working towards my degree. From my experience its recommended you just follow what is on the door placard as well as the pressures. If you're more worried about rolling resistance you can just bump up the pressures on the tires a couple of pounds, excessive increase in pressure causes the tires to wear faster making them go bald down the center, and though mostly shrugged off by most does effect the handling of your vehicle.

[mcrews]

Originally Posted by BrandonMods

I work as a tire technician and have for the past six years while working towards my degree. From my experience its recommended you just follow what is on the door placard as well as the pressures. If you're more worried about rolling resistance you can just bump up the pressures on the tires a couple of pounds, excessive increase in pressure causes the tires to wear faster making them go bald down the center, and though mostly shrugged off by most does effect the handling of your vehicle.

welcome.

Please read the many threads posted. they seem to disagree w/ your experience.
1. please dwfine 'excessive increase in presure'.
I have run 4 sets of Kuhmos 245/50/18 at 44psi on an Infiniti Q45 (please read threads for furthur detail.....am not going to repeat facts already stated).
never experienced "faster wear'.
question: how can increasing psi make it wear faster?
how can a 'steel belted' tire be cause to expand to cause balding?
2. as stated in many posts handling and mpg increase with 40 psi. (please read threads linked above for documentation)
3. at ecomodder we like to prove things as opposed to personal feelings or experience. Not that we dont welcome other thoughts and ideas, but it is fruitless to try to have a discussion over feelings. Much more productive to discuss tested results (good or bad)

[BrandonMods]

Lower tire pressure equals a larger tire footprint. I'm sure even you realize that as the tire is inflated it loses the bulge towards the bottom of the tire which indicates a decrease in the footprint of the tire. Although you may not notice it immediately they do wear out faster. You say that you haven't noticed the abnormal wear yet. But the question is how long have you run those tires at said psi? I do not want to cause an affront but 6 years experience slinging tires on multiple makes and models and hands on experience stands in stark relief as proof to the issues caused by over-inflation of tires. I will not disagree and say it does not aid in fuel mileage, it does, but in the long run it is bad. Mythbusters did a special on it as well and came with the same results that increasing tire pressures do help with fuel mileage but, they did also state that it was not worth it because of the decrease in the life of the tire. Also technically speaking, anything above 7 psi is excessive tire inflation. I hope this clarifies my earlier post.

[mcrews]

Brandon,
You comments show that you are not willing to read the posted links on tire size and psi that I posted. Kinda rude....since I have read both of yours.

this statement refects your lack of interest in learning.....
" Although you may not notice it immediately they do wear out faster. You say that you haven't noticed the abnormal wear yet. But the question is how long have you run those tires at said psi?"
duh.....
But since you insist......here are the FACTS that i have provided already ....
2002 Q45 Sport purchased at 40k in 2005. Today it has 274k miles.
ran 255/45/18 (factory size 245/45/18) for 4 sets of tires. Ran Kohmo Ecsta max performance tires. the utgc rating on this tire is 280. as you know, this tire should only get 25-30k miles. currently running the 245/50/18 on the stock rims. tallest tire that fits.
got 43-45k out of each set.
ran nitro in the last set and current set.
NEVER had the center go bald first.
Wear was even.
Car handled slightly better at the 44psi.
Now, I am the first to admit that I didnt drive hard. Infact I drive for mpg. But if the tire (as you suggest) should have worn 'faster' can you please explain how a lower line tire can wear BETTER.

THe fact is more psi especially below 45psi CAN NOT make a tire wear 'faster'. it's basic chemestry. Heat, age, chemicals, and maybe 60+psi....maybe.


So, yes, I had each set at 44psi for the full 40k miles (but you should know that if you had taken my advise, you'd already know this)
THe last two sets w/ nitro needed NO added nitro over the life of the tires.