Tire Match Question

TomC · July 23, 2016, 08:02:44 AM

295/75R-22.5 and 275/80R-22.5 are the low profile version of the 11R-22.5. You loose about an inch in height and go from a 500rpm tire to 517rpm. The low profile versions are the most popular with trucks. Good Luck, TomC

Lin · July 23, 2016, 08:38:54 AM

What would make low profile more desirable?

TomC · July 23, 2016, 08:48:29 AM

Especially with trucks using 18 tires, the low profile tires are lighter (super singles even lighter). Plus being lower allows to haul a higher trailer for more cargo capacity ($$$).

DoubleEagle · July 23, 2016, 08:54:14 AM

The low proflies can also be run at higher speeds - just ask the drivers of those high priced Prevost Entertainer coaches in a hurry to make the venue.

TomC · July 23, 2016, 08:56:41 AM

Most highway tires, no matter the size, are rated at 75mph. Some even 80.

DoubleEagle · July 23, 2016, 09:03:16 AM

Quote from: TomC on July 23, 2016, 08:56:41 AM
Most highway tires, no matter the size, are rated at 75mph. Some even 80.

That is true, but certain Entertainer Coaches will zip by you if you are going 75 out west.

luvrbus · July 23, 2016, 09:11:21 AM

Quote from: DoubleEagle on July 23, 2016, 09:03:16 AM
That is true, but certain Entertainer Coaches will zip by you if you are going 75 out west.

They zip by you even when you are running the 80 mph speed limit on I 10 in west Texas

eagle19952 · July 23, 2016, 11:09:52 AM

Quote from: DoubleEagle on July 23, 2016, 06:11:37 AM
One thing that annoys me about checking the tire manufactured date is that it seems to be imprinted on one side of the tire only, and when it is on the inside it is much more difficult to spot the number without serious crawling and contorting. In the case of replacement tires being brought to you, you can check them before they are mounted, but it would be even better if you ask about the age before they come out. If nothing else, it puts them on alert that you know about the dating. Being given a five year old tire would deserve a discount in my opinion, but when you are on the road and desperate, they have you in a weak position.

and that is great...but the a professional driver would not care, he would mileage out even a five year old tire in less time than the speculated shelf life...it is not the tire dealers concern that you won't...at least it doesn't have to be..

Lin · July 23, 2016, 11:14:47 AM

It would seem to me that saying a tire expires on the shelf as fast as it does in use does not really make sense. Yes, I understand that the rubber is degrading over time, but a tire that is in use has at least equal degradation plus the affects of having been run under inflated, sitting in the sun, run fast and hot, bumped up against curbs and pot holes, general road use and wear, etc.

B_K · July 23, 2016, 12:31:41 PM

Sitting on a shelf (or anywhere for that matter) is harder on the rubber compound of the tire than rolling down the road.
My dad used to work for General Tire (now Continental Tire) and he was taught that as a tire is in use the rubber flexes and "works" to the way it is supposed to keeping the compound active and lasts longer. When they sit the rubber is not flexing or "working" and gets dry hard which is why you get dry rot and cracks!

Just passing on what my dad was taught @ General tire many years ago. I do not have any degree in this sort of science or any other proof of what has been said!

BK

DoubleEagle · July 23, 2016, 04:29:36 PM

Quote from: B_K on July 23, 2016, 12:31:41 PM
Sitting on a shelf (or anywhere for that matter) is harder on the rubber compound of the tire than rolling down the road.
My dad used to work for General Tire (now Continental Tire) and he was taught that as a tire is in use the rubber flexes and "works" to the way it is supposed to keeping the compound active and lasts longer. When they sit the rubber is not flexing or "working" and gets dry hard which is why you get dry rot and cracks!

I have heard that several times as well, that use works out the protective compounds to the surface. The worst situation is when the tire is sitting on the bare ground, under load, in the sun, for months or years without being used. Cover them up, get the load off, or run them.

DoubleEagle · July 23, 2016, 04:39:05 PM

Quote from: luvrbus on July 23, 2016, 09:11:21 AM

They zip by you even when you are running the 80 mph speed limit on I 10 in west Texas

I believe there was a posting back in the nineties on this board or elsewhere about two Entertainer Coaches (with 600 hp) and low profiles somewhere in the Northwest that was clocked by a trooper at a little over 100 mph. One Coach stopped, and the other kept going. My first thought was "what brand of tires did they have". Someone replied that they must have been low profiles at least. It must have been a rock band in a hurry.

eagle19952 · July 23, 2016, 10:15:05 PM

Quote from: DoubleEagle on July 23, 2016, 04:39:05 PM
I believe there was a posting back in the nineties on this board or elsewhere about two Entertainer Coaches (with 600 hp) and low profiles somewhere in the Northwest that was clocked by a trooper at a little over 100 mph. One Coach stopped, and the other kept going. My first thought was "what brand of tires did they have". Someone replied that they must have been low profiles at least. It must have been a rock band in a hurry.

probably Willie's stash coach

TomC · July 24, 2016, 06:45:26 AM

Many truck racers will take new tires and grind them down to only 1/4" of tread. That takes many pounds of rotating rubber out of the tire to allow for higher tire rpm (I'm talking in the hundreds of miles per hour). Good Luck, TomC