Nitto Speed Ratings

Discussion in 'SRT Hellcat Wheels and Tires' started by VanishingPoint, Jul 16, 2015.

  1. VanishingPoint

    VanishingPoint Silver Member

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    Nitto Speed Ratings.

    Spoke to their Tech line people on their ratings for performance (drag) tires and I quote:
    "They really don't have ratings, but they should be considered Z rated (149 mph).

    Just a word of advice for those considering 1 mile races and such, as

    1. Tech may not allow them due to load and no speed rating (this is a guess though at this point)
    2. That tells me they are designed for brief speeds at those mph numbers, not roaring along for another half mile to get from 150 to 175+

    As always, YMMV.
     
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  2. huggytree

    huggytree Gold Member

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    thought Z rated=200mph

    i noticed they were rated for 149mph also....i doubt i go any faster anyways....ive done 140mph on the street a couple of times in other cars......cant see a reason to go faster here in WI....out West id try for 200mph, but not much for open stretches of road here in WI
     
  3. VanishingPoint

    VanishingPoint Silver Member

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    "Z" rated with the "Y" attached to it is over 186.

    See attached from TireRack:

    When Z-speed rated tires were first introduced, they were thought to reflect the highest tire speed rating that would ever be required, in excess of 240 km/h or 149 mph. While Z-speed rated tires are capable of speeds in excess of 149 mph, how far above 149 mph was not identified. That ultimately caused the automotive industry to add W- and Y-speed ratings to identify the tires that meet the needs of new vehicles that have extremely high top-speed capabilities.

    W 168 mph 270 km/h Exotic Sports Cars
    Y 186 mph 300 km/h Exotic Sports Cars

    While a Z-speed rating still often appears in the tire size designation of these tires, such as 225/50ZR16 91W, the Z in the size signifies a maximum speed capability in excess of 149 mph, 240 km/h; the W in the service description indicates the tire's 168 mph, 270 km/h maximum speed.

    225/50ZR16 in excess of 149 mph, 240 km/h
    205/45ZR17 88W 168 mph, 270 km/h
    285/35ZR19 99Y 186 mph, 300 km/h

    Most recently, when the Y-speed rating indicated in a service description is enclosed in parentheses, such as 285/35ZR19 (99Y), the top speed of the tire has been tested in excess of 186 mph, 300 km/h indicated by the service description as shown below:

    285/35ZR19 99Y 186 mph, 300 km/h
    285/35ZR19 (99Y) in excess of 186 mph, 300 km/h

    As vehicles have increased their top speeds into Autobahn-only ranges, the tire speed ratings have evolved to better identify the tire's capability, allowing drivers to match the speed of their tires with the top speed of their vehicle.
     
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  4. Zebug

    Zebug Gold Member

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    this is great info, thank you VanishingPoint

    Now I'm torn, do I want to hit the Texas Mile this fall or do I want to launch harder at the red lights (b/c only getting 3.8 sec 0-60 on summer tires is so slow right lol). I was thinking of getting the Nittos soon so I can launch better. ugggh deciding sucks
     
  5. 70Cuda

    70Cuda Yep, its got a HEMI

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    Whats the worst that can happen, they come apart at 160 mph:eek:
     
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  6. Zebug

    Zebug Gold Member

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    160 I can handle losing a tire (not really lol)...180, well even I have limitations
     
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  7. HOONAGN

    HOONAGN FLOOR IT!

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    Losing a tire at any speed above 120 on the street causes instant constipation syndrome.

    Not that I know... Damn hemorrhoids:p
     
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  8. VanishingPoint

    VanishingPoint Silver Member

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    That Texas Mile stuff is in their rules but I don't know how strict. Maybe bring both sets?
     

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