Tire rating and MPH

**Frank@Diablosport** · 09-03-2009, 09:28 PM

Could someone please explain the speed rating on tires? What is the meaning of the letters.

How about the speed, if tire x has a curtain rating of lets say 160mph, does that mean that tire x will blow at 161+ mph or higher speeds? Will tire x fail at 160mph in minutes, miles? Im just trying to get a better understanding.

What Im trying to ask is if my Nitto 420's will handle 150+mph in a mile long track.

Thanks

**BlackCharger06** · 09-03-2009, 10:07 PM

Originally Posted by Narc300C

Could someone please explain the speed rating on tires? What is the meaning of the letters.

How about the speed, if tire x has a curtain rating of lets say 160mph, does that mean that tire x will blow at 161+ mph or higher speeds? Will tire x fail at 160mph in minutes, miles? Im just trying to get a better understanding.

What Im trying to ask is if my Nitto 420's will handle 150+mph in a mile long track.

Thanks

http://www.tirerack.com/tires/tirete....jsp?techid=35

**bigjim** · 09-03-2009, 11:51 PM

Tire ratings are for 24 hours at rated speed. You can't reach these speeds with an LX

**BadRT** · 09-03-2009, 11:57 PM

all tire rating is for safety.. the stock 18's on my rt are h rated, 130mph, and ive had them to 160+ many times. if your going to be running any track with street tires i would recommend a w or a z rating

**richierevs** · 09-03-2009, 11:59 PM

Originally Posted by bigjim

Tire ratings are for 24 hours at rated speed. You can't reach these speeds with an LX

I had tread separation with a set of Toyo Proxes 4s on a chassis dyno. The tires were Y-rated (168 mph) and the tech took the car to 182 mph at full load on the dyno. Really pissed me off.

**bigjim** · 09-04-2009, 08:38 AM

That could have been nasty! Did you try for warrenty replacement?

**CT-MSRT** · 09-04-2009, 09:13 AM

Originally Posted by richierevs

I had tread separation with a set of Toyo Proxes 4s on a chassis dyno. The tires were Y-rated (168 mph) and the tech took the car to 182 mph at full load on the dyno. Really pissed me off.

dear lord i would have beaten that tech senseless. I sincerely hope you held that dude responsible and have him pay to replace the tires. Common sense crap right there, check equip before effecting a duty cycle on it.

**richierevs** · 09-04-2009, 09:39 AM

Originally Posted by CT-MSRT

dear lord i would have beaten that tech senseless. I sincerely hope you held that dude responsible and have him pay to replace the tires. Common sense crap right there, check equip before effecting a duty cycle on it.

I would have physically thrashed the little **** if it wasn't for the fact that a cop friend of his was there watching my car on the dyno. It was then that I realized that I was screaming at a no-wit (less than a half-wit) when I could see the back of his head through his eyeballs. Dumb is forever.