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Michelin Sidewall Cracking Chart
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GaryKD



Senior Member

Registered: July 2006
Location: Wellington, Florida
Posts: 10,090
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Michelin Sidewall Cracking Chart
Date: Wed January 27, 2010 · Views: 14748
· Tags: 3
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smashfinger

Junior Member

Registered: February 2010
Posts: 10
Fri February 19, 2010 2:44pm Rating: 10.00 

Thanks much, I was about ready to buy new tires that still have almost full tread. The cracks on my michelins are well within acceptable. This chart just saved me big $.
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George Z

Senior Member

Registered: October 2007
Location: South Jersey
Posts: 1,026
Sat February 20, 2010 12:22pm Rating: 10.00 



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Kathy & George Zimm & 2 Shelties, Merlin & Lancelot
Mickleton, NJ
2006 Coachman Epic & 2013 Chevy Equinox Toad
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cb5300

Senior Member

Registered: November 2007
Posts: 1,161
Tue March 2, 2010 2:22pm

I'm sorry, but the price of a tire is small compared to the cost of repairs to your motor home if you have a blow out. Also my family is worth a lot more than the cost of any tire...If the tire is cracking replace it... Better safe than sorry.

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Charles and Martha*2008 Monaco Signature
FMCA #F388752*GoodSam Life Member
2007 Ford Explorer - Toad
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bigstonebay

Senior Member

Registered: January 2010
Posts: 159
Tue March 9, 2010 9:42am

I agree with cb5300. I wouldn't have any of those tires on my coach. Life is too precious.

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Just living is not enough, One must have sunshine, freedom and a RV.
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bigstonebay

Senior Member

Registered: January 2010
Posts: 159
Tue March 9, 2010 9:42am Rating: 1.00 



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Just living is not enough, One must have sunshine, freedom and a RV.
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bigstonebay

Senior Member

Registered: January 2010
Posts: 159
Tue March 9, 2010 9:43am

I agree with cb5300. I wouldn't have any of those tires on my coach. Life is too precious.

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Just living is not enough, One must have sunshine, freedom and a RV.
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bigstonebay

Senior Member

Registered: January 2010
Posts: 159
Tue March 9, 2010 9:43am

I agree with cb5300. I wouldn't have any of those tires on my coach. Life is too precious.

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Just living is not enough, One must have sunshine, freedom and a RV.
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wddogger

Junior Member

Registered: October 2010
Location: Fullerton, CA
Posts: 24
Sun January 9, 2011 5:03pm

Thanks for the posts! We are newbies (but learning fast). Purchased our rig on 10/26/10 with 31730 miles on it. We have what we believe to be excessive sidewall cracking on all outside tires.
The coach was weighed on 12/1/10 with corner weights (Lbs) as follows: RF=4,000 LF=4300 RR=7060 & LR=7420. Tire pressures (checked cold) were found to be as follows (psi) RF=93 LF=93 RRIS=73 RROS=73 LRIS=76 LROS=73.
We have sidewall cracking on all outside mounted tires (Michlin tires 255/80R22.5 XRV (DOT B6H6 AK3X 3805)). Crack depths average approx. 5/64"(1.9844mm) determined by inserting the corner of a paper strip into cracks, scribing the paper with fine point pencil against the sidewall & measuring marked depth with a micrometer. Tread depth was also measured and found to be 11/32". As I understand it, according to the Michelin Sidewall Cracking Chart (see photos at URL http://www.irv2.com/photopost/showphoto.php?photo=13769 )
my tires are on the verge of "Suspect"!
I've written to Michlin via the form at their website and have asked someone to call me as I am concerned about the safety of the tires. I'll submit additional posts to let all here know their response.


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Wayne (KQ6WG), Bonnie & Sofie (Rottweiler) - '06 Itasca Meridian 36G -Cummins 300HP/Allison 2000 SBW - Onan 7.5KW - '08 Honda CRV (toad) - M&G proportional brake system Last RV - Hans Christian 38T Cutter Rigged Sailboat - Homebase - Fullerton, CA
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gigifern
Junior Member

Registered: July 2012
Posts: 4
Sun August 12, 2012 3:54pm Rating: 10.00 

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Tireman9
Senior Member

Registered: March 2010
Location: Akron, Ohio
Posts: 525
Fri August 16, 2013 5:59pm

I have seen the original Michelin rating cards. They appear smaller than what I see when I view this image "full size". A change in image size i.e. magnification will make the proper rating questionable.

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Retired Design & Quality Tire Engineer. Check out my tire Blog I give seminars on RV tires various RV events in Ohio & nearby states.
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