Severe tire cupping
Thread Starter
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Mountain Pass
Joined: Jul 2019
Posts: 199
Likes: 33
From: Northern California
Severe tire cupping
I'm looking for reasons my tires are cupping. The rear tires appear to be fine, the problem is up front. I'm running oversized tires and truck has had a leveling kit installed by the previous owner. He said he didn't lift the truck other than the leveling kit but it sure looks like it's been lifted to me, this block on the rear axle measures 4". I installed new shocks on the front but if the truck has been lifted 4" the shocks are too short.
Front end pics
The tires are 35x12.50 R18. The front end has been rebuilt a year ago, new ball joints, ect., and the alignment is good. Would dual shocks help?
Thanks for any help.
Front end pics
The tires are 35x12.50 R18. The front end has been rebuilt a year ago, new ball joints, ect., and the alignment is good. Would dual shocks help?
Thanks for any help.
Thread Starter
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Mountain Pass
Joined: Jul 2019
Posts: 199
Likes: 33
From: Northern California
I'll be honest and confess I've never rotated the tires. I hope the fix is just that simple, thanks guys!
Can anybody confirm whether not the truck is lifted from the picture?
Can anybody confirm whether not the truck is lifted from the picture?
Laughing Gas
Joined: Nov 2020
Posts: 994
Likes: 367
From: Republic of Texas
I have a set of 35's on the Bronco and 37's on my military dead dinosaur burner and cupping only get worse once it starts. Cross fronts to the back every 3000-5000 at most and it will minimize the cupping.
The bigger the tire and more aggressive the tread the worse it is.
The bigger the tire and more aggressive the tread the worse it is.
Cargo Master
Joined: Mar 2019
Posts: 2,907
Likes: 788
From: Kinnula,Finland
The bigger/aggressive the tire is,the more it needs to be rotated.
Including flipping in the wheel too.
Including flipping in the wheel too.
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Mountain Pass
Joined: Jul 2019
Posts: 199
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From: Northern California
Never heard of flipping in the wheel, what is that?
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FTE Leadership Emeritus
Joined: May 2014
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From: Lake Hartwell, GA
Proper inflation must be checked regularly. A rotation schedule must be adhered to including side to side.
Even then, sometimes a tire will have issues.
If you are having persistent issues despite your best efforts to avoid or mitigate them, try a different manufacturer or model of ture that has the same or identical usage goals in mind.
I run Cooper ST MAXX 265/75R16 towing heavy 90% of the time. I have ~50,000 miles on them now and on track for 65,000 or more miles. I perform the maintenance steps on them noted above regularly though.
Although, Cooper was just bought by Goodyear, so I may be in the market for a new manufacturer one day.
Good luck to you.
Even then, sometimes a tire will have issues.
If you are having persistent issues despite your best efforts to avoid or mitigate them, try a different manufacturer or model of ture that has the same or identical usage goals in mind.
I run Cooper ST MAXX 265/75R16 towing heavy 90% of the time. I have ~50,000 miles on them now and on track for 65,000 or more miles. I perform the maintenance steps on them noted above regularly though.
Although, Cooper was just bought by Goodyear, so I may be in the market for a new manufacturer one day.
Good luck to you.
FTE Chapter Leader
Joined: Jan 2005
Posts: 13,106
Likes: 4,714
From: Henderson, NV
I think he means flipping the tire on the wheel so that what was the inside sidewall is now outside and vice versa.
What shocks did you replace with on the front? Regular shocks meant for the factory suspension will not work well because they are not valved for the added mass of oversized tires and, as you found out, too short for the lift needed to run the oversized tires.
What shocks did you replace with on the front? Regular shocks meant for the factory suspension will not work well because they are not valved for the added mass of oversized tires and, as you found out, too short for the lift needed to run the oversized tires.
Cargo Master
Joined: Mar 2019
Posts: 2,907
Likes: 788
From: Kinnula,Finland
^^^^
What Noob said,please excuse my Rally English!
Yes,If you installed too short shocks,it may accelerate the cupping effect.
What Noob said,please excuse my Rally English!
Yes,If you installed too short shocks,it may accelerate the cupping effect.
More Turbo
Joined: Sep 2018
Posts: 544
Likes: 213
From: UT
I know you said some of these were done.....but .....
check your shocks....check your sway links....check your ball joints.
I have stopped cupping on 3 different trucks because one or more of these were no bueno.
check your shocks....check your sway links....check your ball joints.
I have stopped cupping on 3 different trucks because one or more of these were no bueno.
Thread Starter
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Mountain Pass
Joined: Jul 2019
Posts: 199
Likes: 33
From: Northern California
I think he means flipping the tire on the wheel so that what was the inside sidewall is now outside and vice versa.
What shocks did you replace with on the front? Regular shocks meant for the factory suspension will not work well because they are not valved for the added mass of oversized tires and, as you found out, too short for the lift needed to run the oversized tires.
What shocks did you replace with on the front? Regular shocks meant for the factory suspension will not work well because they are not valved for the added mass of oversized tires and, as you found out, too short for the lift needed to run the oversized tires.
But that's probably going in the wrong direction
FTE Chapter Leader
Joined: Jan 2005
Posts: 13,106
Likes: 4,714
From: Henderson, NV
The shocks are Rancho RS7000's for front with 2.5" lift. They're supposed to be designed for off road so maybe they're too soft...? Looking at a set of Bilstein B8 5160 remote reservoir shocks and trying to convince myself I neeeed those. But that's probably going in the wrong direction
But that's probably going in the wrong directionAs for the remote reservoir Bilsteins, PMS is a respected tradition here and no one will give you flak for that.