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 > A/T P tires in front, Highway LT's in back, any problem?

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hertfordnc

Hertford, NC

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Posted: 06/26/21 03:01pm Link  |  Quote  |  Print  |  Notify Moderator

I currently have LT all terrains on the back. and a matching set (Firestone Destination) but the fronts are P.
So,i assume the rears are stiffer. It handles like a 4 ton truck.

I'm thinking
replacing the rear with highway tread Michelins will have the same stiffness but better grip on asphalt.

* This post was edited 06/26/21 03:43pm by hertfordnc *


Dave & Ellen Silva

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fj12ryder

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Posted: 06/26/21 04:43pm Link  |  Quote  |  Print  |  Notify Moderator

Yeah, but when people were running "snow tires" nearly everyone was doing that with bias ply tires. IMO the difference between LT tires and "P" rated tires could be noticeable. I would imagine the "P" rated sidewalls would have a lot more flex than LT tires. I don't know that it would be extremely noticeable, but maybe a bit.


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FordMastertech

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Posted: 06/26/21 06:56pm Link  |  Quote  |  Print  |  Notify Moderator

P rated tires should not be on any Ford Excursion's they can't handle the weight load. Ford recalled the OEM LT D rated tires and had us install LT E rated tires. Mixing P rated tires and LT E rated tires on the same vehicle is a accident waiting to happen.


Tim & Donna ">
04 Prowler 830Y lots of mods 5200 lbs Axles 16 inch LT E tires
00 Ford Excursion Limited 4x4 7.3 PSD Pullrite Prodigy Autometer Gauges Magnaflow Exhaust DP Tuner Chip Terminator Big Oil ">


hertfordnc

Hertford, NC

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Posted: 06/27/21 04:14am Link  |  Quote  |  Print  |  Notify Moderator

FordMastertech wrote:

P rated tires should not be on any Ford Excursion's they can't handle the weight load. Ford recalled the OEM LT D rated tires and had us install LT E rated tires. Mixing P rated tires and LT E rated tires on the same vehicle is a accident waiting to happen.


Yeah i don't love it. But they're in front, rated at 2600 lb.

pitch

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Posted: 06/27/21 05:20am Link  |  Quote  |  Print  |  Notify Moderator

fj12ryder wrote:

Yeah, but when people were running "snow tires" nearly everyone was doing that with bias ply tires. IMO the difference between LT tires and "P" rated tires could be noticeable. I would imagine the "P" rated sidewalls would have a lot more flex than LT tires. I don't know that it would be extremely noticeable, but maybe a bit.


What do you mean,"when everyone was running snowtires" everyone runs snow tires today. They are more important than ever.
If you liveany where snow covers the roads most of the time in the wine it is only good sense to run snows. I and most folks around me keep a set of mounted snows,too switch twice a year.
If your truck is all wheel drive or full time drive, measure the rolling differenc in the tires, it don't take much to screw things up.

JRscooby

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Posted: 06/27/21 06:37am Link  |  Quote  |  Print  |  Notify Moderator

fj12ryder wrote:

Yeah, but when people were running "snow tires" nearly everyone was doing that with bias ply tires. IMO the difference between LT tires and "P" rated tires could be noticeable. I would imagine the "P" rated sidewalls would have a lot more flex than LT tires. I don't know that it would be extremely noticeable, but maybe a bit.


Just checking; We are talking about pickups, right? And more exactly, pickups pulling trailers? Not high performance vehicles expected to preform at optimum?
From what I see (and a very small percentage of my driving did I have same size/number tires on both ends of vehicle) the best handling and ride is with tires loaded near but below their weight rating. If the P rated tires likely will have plenty of capacity on the front of pickup. And even when loaded to GVWR, not much of that load is on the front tires. And if the load is on the hitch, even with WDH, the front is likely to weigh less than MT. OTOH, it would be EZ to overload the same tires on the rear, so a heavier rated tire makes sense to me.
As for ride, a stiffer tire transfers more road shock to vehicle to be absorbed by shocks an springs. Half the tires stiffer than needed will make for a rough ride.

Mike134

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Posted: 06/27/21 06:40am Link  |  Quote  |  Print  |  Notify Moderator

JRscooby wrote:

Does nobody remember "snow tires"? Back in the day most people, on most vehicles, ran rear tires that did not match the front for about half the year.
(On my pickups, snow tires in winter, then spring I would name them "Mud Grips")
As for different size F/R. 2 wheel drive, this is not a issue. 4 Wheel drive, can be a problem unless on surfaces you need 4 WD, and tires can slip


X2!! Plus in the early days they always recommended keeping radial tires and bias tires on the same axle, lots of mix and matching back in the old days.

You'll be fine don't listen to the online negative Nellies.


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JIMNLIN

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Posted: 06/27/21 06:41am Link  |  Quote  |  Print  |  Notify Moderator

JRscooby wrote:

Does nobody remember "snow tires"? Back in the day most people, on most vehicles, ran rear tires that did not match the front for about half the year.
(On my pickups, snow tires in winter, then spring I would name them "Mud Grips")
As for different size F/R. 2 wheel drive, this is not a issue. 4 Wheel drive, can be a problem unless on surfaces you need 4 WD, and tires can slip

LOL...back then most pickup trucks on the road around here anywayz had OEM tires on the front and huge tires on the rear. I had no problems with the different F/R sizes with all bias ply.... or all radials.
I found out from actual experience not to mix radials with bias ply. One doesn't track the other very well. Like driving with 10 psi in the rear and carrying a load.

Fed regs require a P tire load capacity to be derated by dividing its capacity by 1.1 when mounted on a truck or trailer. A 2600 lb rated P tire capacity now = 2360 lbs so make sure that number fits the vehicle mfg GAWR requirements for that axle.


"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers

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hertfordnc

Hertford, NC

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Posted: 06/27/21 07:32am Link  |  Quote  |  Print  |  Notify Moderator

JIMNLIN wrote:


Fed regs require a P tire load capacity to be derated by dividing its capacity by 1.1 when mounted on a truck or trailer. A 2600 lb rated P tire capacity now = 2360 lbs so make sure that number fits the vehicle mfg GAWR requirements for that axle.


Ok, i think this horse is dead.

I just looked at the door sticker- "Front Axle Gross Weight 4300 LB"

Really, i had been running LT's in the back and Ps in the front for 30,000 miles (12,000 towing.

My question was about mixing highway tread (LTs) in the rear and All Terrain (Ps) in the front.

I rembember the transition to radial tires and hearing that they did not mix well with bias ply,

noteven

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Posted: 06/27/21 08:50am Link  |  Quote  |  Print  |  Notify Moderator

I’d keep a close watch on the pressures if running 78% nitrogen fill at cruise speeds above 143mph if 87lbs over FAWR/ GVWR/ GCWR.

Other than that it should handle like a pickup truck.

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