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Tire Cupping

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Old Oct 31, 2021 | 06:53 PM
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Default Tire Cupping

Went out to check the tires today.. first I checked the air pressures front and back. All were good only off by 2 psi, but I aired them up to 40 psi rear and I like to run 38 in the front.
Next I rolled the bike to check the tires themselves. The front is OK, I think not so much the rear. Looks like the rear is cupping?




So if y'all can tell from these cell phone pictures...anything to worry about?
 
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Old Oct 31, 2021 | 07:48 PM
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Not uncommon for tires to cup, especially the OE Dunlops. Just keep an eye out for any splitting (unfortunately which has also been known to happen on OE Dunlop’s).


 
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Old Oct 31, 2021 | 07:52 PM
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I’ve got 12k on the OE’s. Cupping and howling. I’ve got some new American Elites sitting in the garage that I’ll probably put on later this winter, but not while I have 4-5/32nds still on the current tires.
 
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Old Oct 31, 2021 | 07:57 PM
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A very good article on motorcycle tire wear with a section on cupping. Enjoy

https://www.rattlebars.com/tirewear/
 
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Old Oct 31, 2021 | 07:58 PM
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Originally Posted by gonemad
I’ve got 12k on the OE’s. Cupping and howling. I’ve got some new American Elites sitting in the garage that I’ll probably put on later this winter, but not while I have 4-5/32nds still on the current tires.
trying to order some American Elites, looks like out of stock everywhere, any suggestions?
 
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Old Oct 31, 2021 | 08:03 PM
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Originally Posted by BouseBill
trying to order some American Elites, looks like out of stock everywhere, any suggestions?
A buddy that lives three hours away and only races sportbikes found mine at a dealer that doesn’t even sell Harleys. I drove six hours round trip to get them, but they do pop up at the on-line outlets periodically.
 
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Old Oct 31, 2021 | 08:29 PM
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What is the date code on that tire? Looks to have some checking/dry areas on the rubber sides.
 
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Old Oct 31, 2021 | 08:47 PM
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Originally Posted by CoolBreeze3646
What is the date code on that tire? Looks to have some checking/dry areas on the rubber sides.
I don't remember the week, but they were both made in 2020

keep in mind where I live, summer temps exceed 110 on a regular basis, that could have a little to do with the appearance.
 
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Old Oct 31, 2021 | 09:03 PM
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I have stock Dunlap on my 20 with 15k on them now, howling a bit now but hope to get a wee bit more out of them but have a set of commander 3 sitting at the dealers ready to put on. Hopefully they don’t have any balance issues as tires are getting hard to find and it does not look like things are going to get any better for awhile.
 
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Old Oct 31, 2021 | 09:04 PM
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Poor suspension damping can increase cupping. Stock Harley suspension is pretty much always underdamped. In other words, they all do that, sir.
 
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