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Technical tire question

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Old May 20, 2017 | 01:57 PM
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Default Technical tire question

I’m looking at swapping out my Michelin Cup’s with the newer Cup 2 version

The current size on the car is - 325/30/19
The new Cup 2’s come in both a 315mm and 325mm width versions of that tire.

Would there be any performance advantage going with a 315mm on this wheel size?

My concern is with the 325, the sizewall is stretched quite a bit; not sure how that affects the tire dynamics.

Thanks in advance for your wisdom
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Old May 20, 2017 | 02:58 PM
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The tires should have an ideal rim width listed for each size. If they're 12" wide rims, I would stick with the 325s. If any narrower, they will stretch the 325s.
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Old May 20, 2017 | 03:02 PM
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Originally Posted by Patriot Six
The tires should have an ideal rim width listed for each size. If they're 12" wide rims, I would stick with the 325s. If any narrower, they will stretch the 325s.
Sorry, forgot to mention the wheel size - 19 x 11’s
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Old May 20, 2017 | 03:07 PM
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I would stick with the 315s so you don't stretch them.
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Old May 20, 2017 | 03:14 PM
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Just spoke with JBSBlown about the street tire he runs, as all his cars have loads of power.

He advised the R888

After doing some research it looks like they have a new “R888R” tire in a 305/30/19, or the previous model “R888" in a 305 or 325mm width.
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Old May 20, 2017 | 03:21 PM
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I would go with either before Cups. The R888Rs look promising.
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Old May 21, 2017 | 03:19 PM
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Originally Posted by HC Mechanic
Just spoke with JBSBlown about the street tire he runs, as all his cars have loads of power.

He advised the R888

After doing some research it looks like they have a new “R888R” tire in a 305/30/19, or the previous model “R888" in a 305 or 325mm width.
Nice chatting with you, and yes. I'd go with the R888R in the 305/30/19, the recommended rim size is 11", so that should work GREAT.
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Old May 21, 2017 | 03:38 PM
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Originally Posted by jbsblownc5
Nice chatting with you, and yes. I'd go with the R888R in the 305/30/19, the recommended rim size is 11", so that should work GREAT.
Sounds great Joel, I'll do just that

Running low on my octane booster as well, do you have a link to order?
Bought so much last round I forget where the heck you told me to get it..
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