done with Dunlops
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Intermediate
Joined: Apr 2011
Posts: 38
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From: Missouri
Cupping
I think the cupping on the Fat Bob "block tread" Dunlop is unique to this tire. The issue is that every other block on each side of the tire cups. There's a larger block then a smaller one and on the opposite side of the tire it's opposite. The smaller blocks wear down and the larger ones do not. when they wear like this it gives a diagonal pattern of cupping back and forth from side to side. Does that make sense? Best I can figure is that the larger blocks are a harder compound and the smaller blocks are a softer compound for grip and the smaller ones simply wear down quicker.
I got 13,500 on the first tire which was mostly straight road. I cupped it out in 5,000 when I was in Arkansas on twisty roads taking curves 15-20 mph over speed limit.
I get the Marathons on tuesday and will report on whether they are an improvement.
I got 13,500 on the first tire which was mostly straight road. I cupped it out in 5,000 when I was in Arkansas on twisty roads taking curves 15-20 mph over speed limit.
I get the Marathons on tuesday and will report on whether they are an improvement.
Advanced
Joined: Jun 2007
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If your tires are cupping you do not have the correct PSI in them. Cupping on on the leading edge of the tread is over inflated and cupping on the trailing edge is under inflated. Just being off by a few PSI can cause cupping. Make sure your tires are warmed upwhen you check your pressure and adjust your PSI.
Road Master
Joined: Apr 2011
Posts: 772
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From: Corpus Christi, TX
In pics I've seen, it does look similar to the way the 200's are stretched onto the 4.5" wheels.
Thread Starter
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Intermediate
Joined: Apr 2011
Posts: 38
Likes: 0
From: Missouri
If your tires are cupping you do not have the correct PSI in them. Cupping on on the leading edge of the tread is over inflated and cupping on the trailing edge is under inflated. Just being off by a few PSI can cause cupping. Make sure your tires are warmed upwhen you check your pressure and adjust your PSI.
Road Master
Joined: Apr 2011
Posts: 772
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From: Corpus Christi, TX
Well, I was wrong about the Night Dragon for the 4.5" wheel.
There's a chart here: http://www.hdwheels.com/Product.htm
There's a footnote under the rear tire/rim chart that says, "** Only 180/60-17 GT502 Dunlop Screamin' Eagle and Pirelli Night Dragon tire fits on 17x4.5 rim". (The ** is from the 180 width chart.)
There's a chart here: http://www.hdwheels.com/Product.htm
There's a footnote under the rear tire/rim chart that says, "** Only 180/60-17 GT502 Dunlop Screamin' Eagle and Pirelli Night Dragon tire fits on 17x4.5 rim". (The ** is from the 180 width chart.)
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Road Master
Joined: May 2006
Posts: 941
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From:
I think the cupping on the Fat Bob "block tread" Dunlop is unique to this tire. The issue is that every other block on each side of the tire cups. There's a larger block then a smaller one and on the opposite side of the tire it's opposite. The smaller blocks wear down and the larger ones do not. when they wear like this it gives a diagonal pattern of cupping back and forth from side to side. Does that make sense? Best I can figure is that the larger blocks are a harder compound and the smaller blocks are a softer compound for grip and the smaller ones simply wear down quicker.
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Tread patterns like the Metz ME880, Dunlop Elites, Avon Cobras and many others do not suffer as bad due to not having block patterns.
All that said, on cars/trucks etc they rotate the tires to offset the cupping.
Cheers and enjoy the riding season.
Edited to change from leading edge wearing faster then trailing edge. I have CRS
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Last edited by man4mopar; Jun 18, 2011 at 09:48 AM.
