Kumho V720
02-09-2016, 12:27 PM
#42
Out of curiosity I measured the two contact patch widths of the 225/45 on our 15x9 6UL. Not the casing or molded tread width, but the actual area that wears.
~214mm Rival-S
~200mm V720
V720 is rounder so molded tread width difference is closer to 8mm, as opposed to the nearly 14mm difference in contact patch. We raced this tire intermediate rain conditions plus 200miles of highway driving at 26psi. I suspect the V720 might roll over more and use more contact patch in full dry conditions. Just the same, it is most definitely narrower than the Rival-S.
~214mm Rival-S
~200mm V720
V720 is rounder so molded tread width difference is closer to 8mm, as opposed to the nearly 14mm difference in contact patch. We raced this tire intermediate rain conditions plus 200miles of highway driving at 26psi. I suspect the V720 might roll over more and use more contact patch in full dry conditions. Just the same, it is most definitely narrower than the Rival-S.
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02-09-2016, 01:33 PM
#44
If you are not class limited to a tire width- run the widest tire you can on the widest rim that you have.
My experience goes like this:
205 on 8" rim- feels sharp, slowest
225 on 8" rim- feels slightly less sharp, lap times are faster than 205 on 8" rim
225 on 9" rim- feels sharp, fastest
If it was me- I'd get the 225 and run it on whatever rims you have.
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02-09-2016, 03:18 PM
#45
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02-09-2016, 04:16 PM
#46
Just a a quick note, the V720's run narrow. I didn't measure the tread but the 225/45 were visibly a bit stretched on 15x9 6UL where the Rival and R1R sit almost square. Haven't run them in full dry conditions yet so no opinion on how they work there. Good in the wet, just not RE71R good there.
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02-09-2016, 04:33 PM
#47
You did it different then.
"I measured the two contact patch widths of the 225/45 on our 15x9 6UL. Not the casing or molded tread width, but the actual area that wears. " -Emilio
We should set a standard and start creating a database before we get too much misinformation
"I measured the two contact patch widths of the 225/45 on our 15x9 6UL. Not the casing or molded tread width, but the actual area that wears. " -Emilio
We should set a standard and start creating a database before we get too much misinformation
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02-10-2016, 01:22 AM
#50
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I would hypothesize that the rears could see just as much edge wear as the fronts on some cars. Depending on driving style, car set up, weight balance...
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02-10-2016, 10:54 AM
#51
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Are these tires really fast enough to warrant being in the +6 category by NASA?
Seems like they're just a budget 200TW tire, not a "cheater" tire with a 200TW rating, or autocross compound like the Rival S.
I'd love to save ~$80/set over star specs, but I need a +2 tire...
Seems like they're just a budget 200TW tire, not a "cheater" tire with a 200TW rating, or autocross compound like the Rival S.
I'd love to save ~$80/set over star specs, but I need a +2 tire...
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02-23-2016, 01:30 PM
#52
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I was about to order a set of these for this spring... So no one here @ MT has seen any delamination issues (aside from those 2 tire rack reviews) from doing trackdays and HPDEs on the 225/45/15 V720s? Looking to those in warmer weather that might already be out abusing them...
I guess if they're good enough for Emilio they're good enough for me, lol.
I guess if they're good enough for Emilio they're good enough for me, lol.
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02-23-2016, 01:32 PM
#53
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Ran across this article when I was doing research on the V720:
Kumho Is Adding Sizes to the Ecsta V720 and Capacity for LT Tires - Retail - Modern Tire Dealer
Looks like we should expect to see full rollout in March 2016 at places like Discount Tire.
Kumho Is Adding Sizes to the Ecsta V720 and Capacity for LT Tires - Retail - Modern Tire Dealer
Looks like we should expect to see full rollout in March 2016 at places like Discount Tire.
I just talked to someone at Discount Tire Direct today, and they told me that the V720 was a Tire Rack exclusive.
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02-23-2016, 11:02 PM
#59
I ran a pair of these this past weekend at AutoClub Speedway on the back of my car with a set of older RS3s in the front.
I'm not super fast (2:05.xxx/street car) and I didn't try to beat he **** out of them; they held up great. Sticky and felt like they let go very progressively. Actually a little more progressive than I remember the RS3s when they were new.
No delaminating at all and ran them at 34 psi hot.
I'm not super fast (2:05.xxx/street car) and I didn't try to beat he **** out of them; they held up great. Sticky and felt like they let go very progressively. Actually a little more progressive than I remember the RS3s when they were new.
No delaminating at all and ran them at 34 psi hot.
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02-24-2016, 08:11 AM
#60
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Thanks, appreciate the reviews.
On the rx8club thread, it sounded like that fellow got a bad set of 720's, some kind of manufacturing defect I guess, since Tirerack apparently took care of him and Kumho actually wanted them back to look at. Hopefully that means that whatever that issue was is now fixed...
On the rx8club thread, it sounded like that fellow got a bad set of 720's, some kind of manufacturing defect I guess, since Tirerack apparently took care of him and Kumho actually wanted them back to look at. Hopefully that means that whatever that issue was is now fixed...
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