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  #1  
Old 05-01-2016, 03:48 PM
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Cupping tires?

Hey guys,

When installing my summer wheels this week my tire guy said I had some bad cupping on my tires. They are one summer season old.

They said cause I trailer a boat? My boat is 15ft aluminum can't be that heavy?

I had an alignment done at the dealer in the winter with my 18inch rims on.

The summer wheels are 22x10 on 285/40/32 Nitto 420 tires. On Niche Milan wheels 35mm offset if I recall

2014 overland v6 75K (Kms)

Any ideas what would cause this?


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  #2  
Old 05-01-2016, 05:35 PM
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Re: Cupping tires?

Quote:
Originally Posted by HelixJeep View Post
Hey guys,

When installing my summer wheels this week my tire guy said I had some bad cupping on my tires. They are one summer season old.

They said cause I trailer a boat? My boat is 15ft aluminum can't be that heavy?

I had an alignment done at the dealer in the winter with my 18inch rims on.

The summer wheels are 22x10 on 285/40/32 Nitto 420 tires. On Niche Milan wheels 35mm offset if I recall

2014 overland v6 75K (Kms)

Any ideas what would cause this?


2014 Jeep Grand Cherokee Overland
I believe cupping is usually a symptom of something wrong with the suspension (correct me if im wrong). Should probably bring it in to get checked.
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  #3  
Old 05-01-2016, 07:49 PM
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Re: Cupping tires?

Cupping on tires is usually caused by toe alignment. I had that issue after installing RRO lift. Maybe having different offset affects the toe?
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Old 05-01-2016, 08:03 PM
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Re: Cupping tires?

yeah, toe, and camber too, but the they are right the boat tow can as well. you have the air ride/load leveling suspension so that should all but eliminate it unless you are pushing weight limits or do hills/mountains, twisty roads. Any uncompensated rear tongue weight un-loads the front some and that effectively imparts some positive camber which also makes toe tough to keep straight while driving since the tires are not properly "pressed" to the road...conversely, if your boat/trailer are negatively weighted so that they lift the hitch the opposite can happen...then you also have load sway that can make a perfect toe/camber spec alignment seem out of spec based on tire wear as the the tail is wagging the dog and your front end effectively pushes/skips/slides down the road...
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  #5  
Old 05-01-2016, 08:13 PM
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Re: Cupping tires?

Thanks for all the advice. I did have a blown rear strut last summer that was replaced when I put the winters on.


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Old 05-01-2016, 08:19 PM
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Re: Cupping tires?

forgot the address the 22" Nitto 420's, yeah that kinda tire size needs a dialed alignment and square/true contact with road surface with the size of it's contact patch...

was your cupping inside or outside edge?
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Old 05-01-2016, 08:21 PM
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Re: Cupping tires?

Quote:
Originally Posted by GoPlzGo View Post
forgot the address the 22" Nitto 420's, yeah that kinda tire size needs a dialed alignment and square/true contact with road surface with the size of it's contact patch...



was your cupping inside or outside edge?

It's on the inside, so I should have another alignment done for summer wheels?


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Old 05-01-2016, 08:35 PM
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Re: Cupping tires?

Quote:
Originally Posted by HelixJeep View Post
It's on the inside, so I should have another alignment done for summer wheels?


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Technically, no. Changing just rim/tire does not change alignment angles only changing suspension components (like a lift kit) does. That said, your summer setup is alot more sensitive to alignment tightness to spec and the spacers change the leverage on the suspension so you really should get it dialed tight with the summers. BTW, I asked outside or inside as outside would point directly to your towing being the likely culprit.
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Old 05-01-2016, 08:36 PM
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Re: Cupping tires?

Quote:
Originally Posted by GoPlzGo View Post
Technically, no. Changing just rim/tire does not change alignment angles only changing suspension components (like a lift kit) does. That said, your summer setup is alot more sensitive to alignment tightness to spec and the spacers change the leverage on the suspension so you really should get it dialed tight with the summers. BTW, I asked outside or inside as outside would point directly to your towing being the likely culprit.

So it being the inside would that mean the towing? Thank you for the replies as well


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Old 05-01-2016, 08:43 PM
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Re: Cupping tires?

Quote:
Originally Posted by HelixJeep View Post
So it being the inside would that mean the towing? Thank you for the replies as well


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could be but unless you have an improper trailer for the boat length and weight (like need more axles than u have) I suspect alignment is at outer edges of spec and that size/type of tire will telegraph that via cupping/feathering...does she tramline like crazy on you? with a tight alignment the tramlining will be reduced to acceptable levels.
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Old 05-01-2016, 08:45 PM
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Re: Cupping tires?

I wouldn't be surprised the boat trailer isn't special and the tongue is not long. Could be a contributing factor. ImageUploadedByJeepGarage1462149861.995959.jpgImageUploadedByJeepGarage1462149882.600341.jpg


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  #12  
Old 05-01-2016, 08:51 PM
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Re: Cupping tires?

I missed teh 18ft alum comment in your first post.....oh, no, your boat/trailer are not the problem...as tow loads go your Overland is not even breaking a sweat...your softer, narrower 18 winters are just not as sensitive as the your harder and larger contact patch Nitto 420's are...make sure you tell them you wan't it tight spec and you want the before/after color printout as it will show how loose it was and how tight it is now.
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