[Z06] The new Kumho 355 ACR Tires Fit Like a Glove!
Thread Starter
Instructor
Joined: Oct 2013
Posts: 110
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The new Kumho 355 ACR Tires Fit Like a Glove!
CF5 18x10 +40 and 19x12 +57
295/35zr18 Toyo Proxes 1 (Very tight but no rubbing yet)
355/30zr19 Kumho v720 ACR (2016 Viper ACR)
Custom Made Wheel C6 Caps
Extremely happy with the look, grip and road feel. They are a little noisy compared to the quiet INVOs that came on it.
295/35zr18 Toyo Proxes 1 (Very tight but no rubbing yet)
355/30zr19 Kumho v720 ACR (2016 Viper ACR)
Custom Made Wheel C6 Caps
Extremely happy with the look, grip and road feel. They are a little noisy compared to the quiet INVOs that came on it.
Melting Slicks
Joined: Oct 2011
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From: Naples FL
2023 C6 of the Year Finalist - Modified
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Exactly how much wider are the 355's compared to the 345's?
Thread Starter
Instructor
Joined: Oct 2013
Posts: 110
Likes: 13
Lets see:
The 355 were 14" unmounted and 13" mounted on 12" wheels. Tire brands have there own size and I would think these are the same as the 345 MPSS.
I would say they have R888 like grip but heavier and a 100% street legal OEM tire. They have mild road noise like the R888.
The Z is stock height and no front rubbing at all even lock to lock. I would think they are so tight that maybe a bump or dip at full lock would rub.
No rubbing at all in the rear and they most likely the same as the wider than normal 345 MPSS. The INVOs that came on it were narrow for 345. I think these are narrow 355s or the 12" wheel pulled it in some. I would think on a 13" wheel they would be 13.5" mounted.
I had 295/35zr18 Cont DW tires on the front of my black C6Z and they never rubbed; but these P1s look more square and could be tighter.
The 355 were 14" unmounted and 13" mounted on 12" wheels. Tire brands have there own size and I would think these are the same as the 345 MPSS.
I would say they have R888 like grip but heavier and a 100% street legal OEM tire. They have mild road noise like the R888.
The Z is stock height and no front rubbing at all even lock to lock. I would think they are so tight that maybe a bump or dip at full lock would rub.
No rubbing at all in the rear and they most likely the same as the wider than normal 345 MPSS. The INVOs that came on it were narrow for 345. I think these are narrow 355s or the 12" wheel pulled it in some. I would think on a 13" wheel they would be 13.5" mounted.
I had 295/35zr18 Cont DW tires on the front of my black C6Z and they never rubbed; but these P1s look more square and could be tighter.
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Le Mans Master
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From: Chester County PA
Race Director
Joined: Mar 2001
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From: Prescott AZ
St. Jude Donor '04
Looks Great. I agree about mixing tires but those Kumho's look very interesting! and they make a 295/25/19
Last edited by Wicked C5; Apr 7, 2016 at 05:01 PM.
Thread Starter
Instructor
Joined: Oct 2013
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"The 2016 Dodge Viper ACR is fitted with Kumho® Ecsta V720 high-performance tires designed specifically for the car with unique tread pattern and compounds for front and rear. In testing, the new tires produce lap times that are 1.5 seconds faster than off-road-only race tires."
R888s are almost ten year old in technology. Times change...
R888s are almost ten year old in technology. Times change...
Thread Starter
Instructor
Joined: Oct 2013
Posts: 110
Likes: 13
I think you're over analyzing the issue. It not like they are all the same size on a C6Z. The rears are 60mm bigger and that alone makes them mismatched to start with. It's all about time behind the wheel and seeing how they act.
Last edited by Mikael Smed; Apr 7, 2016 at 08:03 PM.
Instructor
Joined: Jul 2005
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I think you might be mis-understanding the concern. The stickiness, predictability, etc are very different on the two tires you have. Never thing of taking on the track as that would be scary. On the street, its mainly for show anyways, so not likely to get up to optimal temps anyways. On a drag strip, won't matter either. Just don't take on a track.
Safety Car
Joined: Jun 2003
Posts: 4,250
Likes: 656
From: San Diego Ca
2 different sizes of the same brand and type of tires is OK. 2 different brands or even types within the brand is not ok unless you only want to putter around town.
You don't want to go through the same thing you did over the winter again because of tires.
You don't want to go through the same thing you did over the winter again because of tires.
Racer
Joined: Aug 2012
Posts: 333
Likes: 12
From: Metro Detroit Michigan
I think you might be mis-understanding the concern. The stickiness, predictability, etc are very different on the two tires you have. Never thing of taking on the track as that would be scary. On the street, its mainly for show anyways, so not likely to get up to optimal temps anyways. On a drag strip, won't matter either. Just don't take on a track.
I understand the tires are different widths from the factory, as with all Corvettes. That's not the problem.
The problem is when you have two completely different tires (different compounds, different contact patches, different limits, etc). This can make the car pretty unpredictable, regardless of seat time.
Le Mans Master
Joined: Sep 2010
Posts: 7,579
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From: Chester County PA
How much better do the R888s grip?
Once my new Wheels get here I have R888s to put on the back of my car. I'm keeping the Invos up front. It's just the streetcar and I wanted some more traction, but I still like to turn.
Once my new Wheels get here I have R888s to put on the back of my car. I'm keeping the Invos up front. It's just the streetcar and I wanted some more traction, but I still like to turn.
Last edited by Never-Enough; Apr 8, 2016 at 02:00 PM.
Burning Brakes
Joined: Jun 2007
Posts: 1,122
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On the track these puppies stick damn near a hoosier, not quite an R6 but close. The R888s ride better than my old Michelins, stick better, and last a ridiculously long time for what they are. I have 4 track days and 13,000 street miles and the fronts probably have another season and 1-2 track days left. Rears perfect. I forget my alignment, like -1.2 camber I think. Only downside is the slight tire hum at highway speeds.