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12-01-2013, 07:13 PM
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#1
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Senior Member
Join Date: Oct 2011
Posts: 251
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Tire Cupping
What is the most likely cause of tire cupping? Both front tires are cupping on the outside edge.
__________________
2011 Monaco Knight 36', MaxForce 10, 350HP, 1150 lbs. Torque.
2008 Saturn Vue Toad, SMI Duo Brake, Roadmaster Sterling Tow Bar
San Antonio, TX Home Port
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12-01-2013, 07:20 PM
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#2
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Senior Member
Join Date: Jul 2011
Location: Lexington NC
Posts: 1,952
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Are they Goodyear tires? If so they are notorious for it. Mine did it before I replaced with michelins although not as bad as some have.
Chad
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12-01-2013, 08:51 PM
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#3
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Senior Member
Monaco Owners Club
Join Date: Sep 2010
Location: Alberta
Posts: 1,429
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Just curious as to how many miles you have on them.
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Trap, Jan and the Pup
2013 Monaco Diplomat 43dft
2010 Black Jeep Liberty
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12-01-2013, 09:22 PM
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#4
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,103
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When mine were cupping it was because of alignment. Had it aligned and new tires installed...problem cured.
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2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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12-02-2013, 01:05 AM
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#5
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Senior Member
Monaco Owners Club
Join Date: Jun 2012
Location: Merritt Island, FL
Posts: 1,742
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I agree. I put new goodyear tires on and aligned my front end. Now have 25K on tires. No more issues. Also make sure you have enough pressure in tires. I run my front tires at 105PSI.
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12-02-2013, 01:35 AM
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#6
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Senior Member
Winnebago Owners Club Florida Cooters Club Freightliner Owners Club
Join Date: Nov 2013
Location: florida west coast
Posts: 453
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had prob like this with motorcycle, tech said, under inflated tires will cause this.
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Well Itasca got totaled. Just picking up a 2021 5th wheel, (first one). Arctic Wolf. Do miss my Diesel pusher.
IT Guy.
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12-02-2013, 05:02 AM
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#7
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Senior Member
Monaco Owners Club Texas Boomers Club
Join Date: Jan 2009
Posts: 2,529
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For some reason it's called "rivering"... Google that on iRV2 and get ready to read for hours.
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Hal & Ginny Miller '04 Beaver Santiam PRT40
'04 Saturn Vue - US Gear Brake - Blue Ox tow
3"girls" (2 Irish Setters - 1 Retriever) - RIP Annie & Emily (12/26/2017)
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12-02-2013, 07:34 AM
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#8
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Senior Member
Join Date: Oct 2011
Posts: 251
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Tires are Goodyear with 21,000 miles, but the cupping has been happening for some time. If it was simply a matter of tire brand I doubt it be happening exactly the same on both front tires. I am in Yuma for four months. Does anyone know of a good alignment shop in the area?
__________________
2011 Monaco Knight 36', MaxForce 10, 350HP, 1150 lbs. Torque.
2008 Saturn Vue Toad, SMI Duo Brake, Roadmaster Sterling Tow Bar
San Antonio, TX Home Port
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12-02-2013, 08:22 AM
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#9
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Senior Member
Ford Super Duty Owner
Join Date: Jan 2011
Location: Lowell, Arkansas
Posts: 7,297
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A simple answer is this. Cupping is usually the result of the tire not staying on the ground with the same pressure. Shocks dampen tire up and down movement from road changes. If the shocks don't absorb that energy the tires continue to oscillate. So weakened shocks won't keep the tire in as close a contact as good shocks. That is the primary cause of cupped tires.
Incorrect toe will cause a feather edge pattern on both front tires. Since the steer tires will tend to toe out when weight is placed on them the industry standard is 1/16" of toe in (the front of the tire is 1/16" closer than the rear).
Incorrect camber + or - will cause either inner or outer edge wear.
Caster misalignmentis not usually indicated by any tire wear patterns.
So you are back to shocks as your main cause but tire inflation pressures also enter into the picture. It is still recommended by ALL tire manufacturers to inflate your tires based on the weight that they carry and not the MAXIMUM PRESSURE indicated on the tire sidewall.
I would never blame a tire or a tire manufacturer as the cause of cupping. I've read to much about tires. Yes some tires will cup faster than others due to design issues, quality of rubber (cheaper tires), where it is driven, etc. But there is still a cause or reason why the tire cupped and that can be corrected.
TeJay
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TeJay Auto Instructor/4-yrs USAF/ Liz: RN/ WBGO 2014 Vista 30T/ F-53/CHF/5-Star/Koni * Bella & Izzy * Golden /Cocker mix/ Louie The Cat* All Retired
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12-02-2013, 08:42 AM
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#10
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Senior Member
Monaco Owners Club
Join Date: Sep 2007
Location: Gilbert, AZ
Posts: 1,717
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Quote:
Originally Posted by wigginsjsr
Tires are Goodyear with 21,000 miles, but the cupping has been happening for some time. If it was simply a matter of tire brand I doubt it be happening exactly the same on both front tires. I am in Yuma for four months. Does anyone know of a good alignment shop in the area?
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The Goodyear tires started cupping on our 07 Camelot at about 15000 miles -- Had front end aligned, & rotated tires from left rear to front-- Another 15000 & the same thing happened again -- Put Michelin all the way around, & 35000 miles later, no cupping -- New Bilstein shocks probably helped -- William Willard
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12-02-2013, 11:14 AM
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#11
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Senior Member
Ford Super Duty Owner
Join Date: Jan 2011
Location: Lowell, Arkansas
Posts: 7,297
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Slight disagreement with under-inflation. That usually causes center tire wear all around and not cupping. Now under-inflation and bad shocks together will cause center tire wear and cupping at the same time. They each are the result of different issues.
When trying to diagnose you have to look at cause and effect. What symptoms will be exhibited when something malfunctions??? Once the symptom has been identified then go to the item that caused that symptom. One major problem is sometimes things are interrelated and that causes a misdirection in finding the solution. That's why good diagnostic technicians are not a dime a dozen.
TeJay
__________________
TeJay Auto Instructor/4-yrs USAF/ Liz: RN/ WBGO 2014 Vista 30T/ F-53/CHF/5-Star/Koni * Bella & Izzy * Golden /Cocker mix/ Louie The Cat* All Retired
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12-02-2013, 11:25 AM
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#12
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Senior Member
Monaco Owners Club
Join Date: Aug 2007
Location: Gardnerville, Nevada
Posts: 1,336
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Goodyears are notorious for doing that and while an alignment might be the cause I'm betting it's not the problem it's the tires. Mine did the same thing starting at 15,000 miles so I had alignment checked and everything was right on and I had been running 115psi in the front. Inner tread on duals even started to show similar wear. Replaced with Michelins and very happy with them.
Since I have changed tires I have made it a point to look at other coaches with Goodyears and I'm amazed at how many have the same rivering issue I had. IMO Goodyear has an issue with their tires and they really aren't addressing it.
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Ken, Chris and Maverick (Golden Retriever)
2009 Beaver Contessa
1984 LS1 CJ7 & 2017 Yamaha YXZ SS SE
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12-02-2013, 11:58 AM
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#13
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Senior Member
Monaco Owners Club
Join Date: Aug 2007
Location: Gardnerville, Nevada
Posts: 1,336
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I would also check the shocks if they are Monroes you are right at the milage they usually need to be replaced. Replaced mine just before the new tires were installed and they were shot.
__________________
Ken, Chris and Maverick (Golden Retriever)
2009 Beaver Contessa
1984 LS1 CJ7 & 2017 Yamaha YXZ SS SE
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12-02-2013, 05:29 PM
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#14
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Senior Member
Ford Super Duty Owner
Join Date: Jan 2011
Location: Lowell, Arkansas
Posts: 7,297
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First mistake ever!!! LOL I got mixed up on my last post. Under-inflation causes outer tire edge wear not inner.
TeJay
__________________
TeJay Auto Instructor/4-yrs USAF/ Liz: RN/ WBGO 2014 Vista 30T/ F-53/CHF/5-Star/Koni * Bella & Izzy * Golden /Cocker mix/ Louie The Cat* All Retired
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