Goodyear Endurance tires - Page 4

Javi · 10-02-2018, 04:32 AM

Quote:

Originally Posted by flybouy

I think your mixing the 2 measurements, m.p.h. vs r.p.m. Placing a tire on the surface of the drum is no different than placing it on the road. Think of the drum as the road wrapped around a shaft. If you think about your truck pulling a small utility trailer or boat trailer. Your truck can have 33" tires andthe trailer 8" tires, going down the road the r.p.m. of the tires will be vastly different but both vehicles, and their tires are going the same m.p.h. The smaller tire will be spinning at a faster r.p.m. in order to to travel the same distance as the large tire.

That's exactly what I'm saying... so no matter how you spin it... if you spin multiple diameter tires at the same RPM they are not spinning at the same MPH... it just doesn't happen (well except on the internet)

I'm asking how... spinning a 31 inch tire at 250 RPM with X-load on it equates to the 65 MPH maximum speed of an ST tire... If he really is an engineer, he knows "that" is what I was asking..

As you said MPH is a measurement of time and distance.. The tire is spec'ed at X-mph maximum with Y-load

In the case of a tire MPH is subject to diameter and RPM unless it's in a box on a flat bed truck traveling down the highway..

rhagfo · 10-02-2018, 06:00 AM

Quote:

Originally Posted by Javi

I understand the relationship of MPH to Circumference of the test drum... But that still doesn't explain HOW that references the TIRE... If you put a 31" tire in the test drum the diameter of the tire will dictate the distance relationship to the tire itself.. The rotational speed of the drum is only part of that equation..

Actually...

31” diameter tire will have to turn 650 RPM to do 60 mile per hour

31 x 3.1416 = 97.3896

63360 / 97.3896 = 650.583 revolutions per mile

Multiply the diameter of the tire by Pi to get the circumference of the tire and then divide the inches in a mile (63,360) by the circumference of the tire.. that gives you the revolutions per mile... after that it's easy..

I think I studied this in 5th or 6th grade, but that was a long time ago...

BTY the test drum is turning 299.987 revolutions per mile..

Javi, if the surface of the test drum is moving at 65 mph, the wheel diameter of the test tire has nothing to do with it other than a smaller diameter will spin faster than a larger diameter tire, but all are traveling at 65 mph. Just like on the highway when you are going 65, small tire will spin faster than a larger tire.

jsmith948 · 10-02-2018, 06:09 AM

Yeah...but. The smaller diameter tire's tread surface will be traveling faster than a larger diameter tire (covering more inches per mile/turning more revolutions per mile). Doesn't seem like forward measured speed of the vehicle on which the tire is mounted would have anything to do with the stress on the tire - it is the speed at which the tire spins (centrifugal force)

Javi · 10-02-2018, 06:35 AM

If you are using friction from the test drum to rotate the tire and the drum is larger than the tire the equivalent MPH of the tire is still less than that of the drum..

The larger the diameter the more distance traveled per revolution...

internet aside you can't change the laws of physics.

Snoking · 10-02-2018, 06:57 AM

Quote:

Originally Posted by Javi

If you are using friction from the test drum to rotate the tire and the drum is larger than the tire the equivalent MPH of the tire is still less than that of the drum..

Only if you have a way to apply a brake on the tires spindle. Assuming a free spinning bearing assembly the required pressure against the drum, the tires surface speed will be matched to the drum surface speed.

That said I watched a 895HP/1400TQ dyno run where the tires were throwing rubber and sparks off the drum.

Getn off · 10-02-2018, 07:19 AM

So. Remember the Goodyear Endurance tire post? Are they worth buying?! My 5er is sitting at about 13, with a 14k max. Do I need a higher load limit than E? Or is that overkill. Can't find anything higher for my size, 235/80r16.
And please kepp the techie mumbo jumbo to an absolute minimum...I only fly airplanes for Gods sake.
Troy

Javi · 10-02-2018, 07:23 AM

Quote:

Originally Posted by Getn off

So. Remember the Goodyear Endurance tire post? Are they worth buying?! My 5er is sitting at about 13, with a 14k max. Do I need a higher load limit than E? Or is that overkill. Can't find anything higher for my size, 235/80r16.
And please kepp the techie mumbo jumbo to an absolute minimum...I only fly airplanes for Gods sake.
Troy

If you have 7K axles and 8 lug wheels with a pressure rating of 110 lbs you can but G rated tires for that 16 inch wheel..

Javi · 10-02-2018, 07:25 AM

Quote:

Originally Posted by Snoking

Only if you have a way to apply a brake on the tires spindle. Assuming a free spinning bearing assembly the required pressure against the drum, the tires surface speed will be matched to the drum surface speed.

That said I watched a 895HP/1400TQ dyno run where the tires were throwing rubber and sparks off the drum.

That's what I'm saying...the surface speed will be very close to equal but the relative MPH of the tire will not be the same as the drums..

Snoking · 10-02-2018, 07:32 AM

Quote:

Originally Posted by Javi

That's what I'm saying...the surface speed will be very close to equal but the relative MPH of the tire will not be the same as the drums..

That is a double negative or something like that.

If the surface speed is the same the MPH are the same.

Getn off · 10-02-2018, 07:38 AM

Quote:

Originally Posted by Snoking

That is a double negative or something like that.

If the surface speed is the same the MPH are the same.

Pretty sure he is just saying the inner dia of any tire on that drum will have the same rpm and mph. A tire on the drum (well the part that touches the pavement) will be further away...ie 80%of 235 which will cause it to have a diff mph.
Right?!
Troy

And are u saying there are no G ratings with a 16" rim?

Snoking · 10-02-2018, 07:44 AM

Quote:

Originally Posted by Getn off

Pretty sure he is just saying the inner dia of any tire on that drum will have the same rpm and mph. A tire on the drum (well the part that touches the pavement) will be further away...ie 80%of 235 which will cause it to have a diff mph.
Right?!
Troy

Why is this so difficult tire size/ratio etc has nothing to do with it. A small tire will turn MORE RPM's. The MPH at CONTACT point will be the same.

Snoking · 10-02-2018, 07:46 AM

Quote:

Originally Posted by Getn off

And are u saying there are no G ratings with a 16" rim?

Sailun makes their 16" LRG all steel tire in two sizes.
LT235/85R16
LT235/80R16

Chris

hornet28 · 10-02-2018, 08:51 AM

Come on you guys give it a break. Neither of you are going to convince the other of your way of thinking

rhagfo · 10-02-2018, 09:11 AM

Quote:

Originally Posted by Javi

That's what I'm saying...the surface speed will be very close to equal but the relative MPH of the tire will not be the same as the drums..

How can you not see this?

If the surface of the test drum, is spinning at a speed that makes the surface past a fixed point cover 5,280' in 60 seconds then a test tire placed into contact with that surface will be spinning at the necessary revelations (per minute) for it's surface to also cover 5,280' in 60 seconds.

It doesn't matter if the test wheel is 10' in diameter, and the test tire 2' in diameter, the surface of both will cover 5,280. The 2' diameter test tire will be spinning at a higher RPM than the test drum, BUT the surface of each will still cover 5,280' in 60 seconds.

Javi · 10-02-2018, 09:25 AM

Oh.. I saw it several posts back when it was stated that the drum was driving the tire and not around the tire as a safety shield.. but it was just too much fun jacking with ya'll to stop.

All anyone had to do was answer my question about how the diameter differential was compensated, but ya'll chose to condescend.

So I chose to push some buttons.

Getn off · 10-02-2018, 09:51 AM

Thx Chris. I will check them out.
TROY

ctbruce · 10-02-2018, 10:15 AM

Bots, let's stay on topic.

Snoking · 10-02-2018, 11:53 AM

Quote:

Originally Posted by Javi

Oh.. I saw it several posts back when it was stated that the drum was driving the tire and not around the tire as a safety shield.. but it was just too much fun jacking with ya'll to stop.

All anyone had to do was answer my question about how the diameter differential was compensated, but ya'll chose to condescend.

So I chose to push some buttons.

Like a dog, I think someone just kick their legs to cover their work.

travelin texans · 10-02-2018, 12:31 PM

I've wore out 3 sets of tires since this thread began!!
Now know way more about tires, rpm, sidewalls & LT vs ST that I never wanted/needed/cared to know!
I've had rvs for 40+ years, when the OEM tires wore out I went up at least load range more & the only tires that have ever blown up were LTs, a fluke, bad luck or bad tires, who knows.
To the OP, the Endurance are new on the market so not a lot of real definite reviews, Carlisle, Maxxis, Sailun have very good track records, so skip all these 8 pages of BS & go buy the tires you want.

**flybouy** · 10-02-2018, 12:45 PM

Well I guess this explains it all!

In my youth I built and raced drag cars. The tires/wheels on the front were smaller than the Micky Thompsons on the rear. Apparently I was breaking several Federal Laws and Laws of Physics according to the "experts". For the life of me I can't figure out how those front tires crossed the line ahead of those rear tires.

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