Which would you say adds more stress to the axels? the actual overall diameter of the tire, or the weight of the tire?

The reason im asking is because i want to buy an extra set of 35' A/T tires that I can swap out with my 33' M/T tires. Ideally my goal would be to get a 35' A/T tire that would keep my mpg the same (if not better) and not add to the possibility of axels snapping off road should i choose to wheel with the A/T (if possible)

Im figuring the added height of a larger tire should be at least the same mpg as a smaller mud tire, because of rolling resistance, but idk thats why im asking

the tire i really want is about 2 1/2 taller and about 14bs heavier But their are several choices for me that would give me the extra height i want and keep me at the same weight, I just dont like those tires

also I have a 2011 auto sport with 4.88 gears and no lockers.

 

The increased torque required to turn a taller tire is what is most likely to add stress to the axle shaft.

 

I dont understand why 2 tires the same weight would not use the same power to turn, plus with a larger tire shouldn't the rpm drop to keep the same speed?

or am I just over thinking this

 

You don't see why the taller tire requires more torque to turn?

 

if your properly geared for a 35' tire vs being properly geared for a 33' tire and both tires are the same weight, wont the larger tire need less rpm to move at 2mph vs the smaller tire?

im just trying to understand is all, when i see people snap their axel there usually spinning their tires at a high rpm than catch traction and pop.

also, I dont see why you need more torque to move something the same weight, but I do see you need more torque to keep the rpm's equal, but equal rpm's on different size tires are different speeds so that cant be a fair comparison?

 

Spinning, then catching, is an entirely different issue.

Your original question was " Which would you say adds more stress to the axels? the actual overall diameter of the tire, or the weight of the tire?"
Assuming you meant axle shaft, the taller tire is harder for the axle shaft to turn, regardless of how it's geared.
When you are trying to crawl over and obstacle, or go up a steep grade, it will require more torque applied to the axle shaft with the taller tire.
The extra torque required for the added weight of a heavier tire is negligible.
Therefore, the tire diameter has a bigger effect on axle stress than tire weight.

Regarding spinning, then catching, the taller tire will be easier for sudden traction to stop rotation.
There again, tire diameter has the bigger influence.

 

alright thanks, making more sense to me now.

 

As to weight. Jp magazine did an article for every 10 lbs in tire weight it's equivalent to 100lbs of added vehicle weight per tire because of the force. ( I can't remember the term they used) so 10 lbs heavier a tire is 400 lbs in added weight that it needs to turn them. Look up the article online at jp mag.

 

The only add on to this I will toss is that when selecting a tire, be cautious on the actual tread width. I am running the FC II's in 35x12.5 and the tread contact width is the full width of the sidewall. I like the tire and all but have noticed the 'extra' tread width is a little extra stress on the steering. Tends to pull a little more than many of the others that have a little less and more rounded tread width.
My 2 cents.
Mandor6863

 

Thanks for the heads up on that article, here is a link to it if anyone cars to read it. http://blogs.jpmagazine.com/6658918/...ght/index.html