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The Ecsta V720 ACR is Kumho’s Streetable Track & Competition tire originally developed in the 295/25R19 90Y (front) and 355/30R19 99Y (rear) sizes as Original Equipment on the 2016 Dodge Viper ACR (American Club Racing) ¿ the fastest street-legal Viper track car ever. Designed for driving enthusiasts looking for ultimate performance on dry pavement, the Viper ACR’s Kumho tires, refined suspension and Extreme Aero package (developing nearly one ton of downforce at the vehicle’s top speed) are said to be capable of delivering sustainable 1.5 g cornering forces in high-speed turns. Like all Streetable Track & Competition tires, the Ecsta V720 ACR is not intended to be serviced, stored nor driven in near- or below-freezing temperatures, through snow or on ice.
Ecsta V720 ACR tires mold Kumho’s super high-grip synthetic resin and ultra-fine carbon black enhanced tread compound into an asymmetric design that begins just 6/32″ deep. Massive outboard shoulders deliver dry road responsiveness and cornering. Many of the lateral tread design features are very shallow in depth, resulting in a virtual slick tread design early in the tire’s life.
Warning: Ecsta V720 ACR radials meet DOT requirements, however they are not recommended for driving in wet conditions where standing water is present and there is the risk of hydroplaning; drivers should drive cautiously at significantly reduced speeds if they encounter these conditions. This is especially true of worn tires.
The tire’s casing was developed using Kumho’s ESCOT tension control optimization technology that allows engineers to tune the bead, sidewall and shoulder rigidity to optimize footprint pressure distribution and uniformity. This results in less flexing and cooler operating temperatures that improve durability.
The tire’s internal structure includes dual high-tensile steel belts reinforced by spirally wound nylon to provide excellent strength and high-speed capability while the sidewalls are tuned to resist lateral deflection and to provide handling control and positive feedback.
Founder at Tiresout. Used to be working as an engineer at Bridgestone Tires Akron Technical Center. The responsibilities included but were not limited to technical computing, indoor & outdoor testing of new tires.
Yes, the 355s fit perfect on a C6Z; and look and ride great. Highway noise is more than normal street tires but that’s what the open exhaust is for.
If you’re reading this review for this tire, than you’re one of the few lucky owners of the new 2016 ACR Viper.Just finished my first track event and all I can say is that these tires for a DOT approved tire are the BEST tires I’ve ever driven. The mechanical grip is unbelievable. Better than all out slicks. Price are most reasonable tires I’ve ever seen for a tires this size and performance.Kumho outdid themselves.
The ACR stock tires are excellent. Better than the Toyo R888 that I used to use on my Lotus Elise but not quite as good as the Hankook slicks I used after the Toyo. For street duty, the Khumos are very good in dry weather and as far as I could tell, they hold up pretty well in the rain but you must drive much slower (evidently).As far as track duties go, again, the Khumos are great but the front tires will last anywhere between 6 and 12 sessions, and for those who are fast, they’ll get one day out of a set. The rear tires last about twice as long. Fortunately they aren’t outrageously expensive but a lot of ACR owners end up switching to slicks because they let longer.
If you are looking for the perfect tire for your 2013+ Dodge Viper ACR, this is as good as it gets!Designed by Kumho for the ACR (it even has the ACR logo embossed on the tire wall), this tire will leave you speechless!