Woodalls Open Roads Forum: General RVing Issues: Tire Speed Rating Question
Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Help and Support  |  Contact

Search:   Advanced Search

Search only in General RVing Issues

Open Roads Forum  >  General RVing Issues

 > Tire Speed Rating Question

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 7  
Next
Francesca Knowles

Port Hadlock, Washington

Senior Member

Joined: 02/23/2011

View Profile



Posted: 07/19/13 01:41pm Link  |  Quote  |  Print  |  Notify Moderator

I'm posting this here because the speed rating of a tire seems to me to cross all lines/types of vehicles.

Reading up on warranty issues/questions just now, I came across the following language w-a-a-a-y down the page at Firestone/Bridgestone tire FAQ's
Firestone/Bridgestone wrote:

The tire’s speed rating is void if the tire is repaired..... snip for clarity.....It should be treated as a non-speed rated tire.

That's repeated in the warranty published at this link (page 14)

What the heck does that mean?


" Not every mind that wanders is lost. " With apologies to J.R.R. Tolkien

D & M

Laurel, MD

Senior Member

Joined: 03/04/2005

View Profile



Good Sam RV Club Member


Posted: 07/19/13 01:48pm Link  |  Quote  |  Print  |  Notify Moderator

It means that the basis used to give the tire a speed rating is canceled because the integrity of the tire has been compromised. You can no longer count on that information being true. It could fail at any speed and the manufacturer does not back up the original rating


Dave
Mary, the world's best wife (1951-2009) R.I.P
Lizzy (the Boston)
Izzy, Pepper & BuddyP - Gone but not forgotten
2005 Itasca Suncruiser 35A

Dear McDonald's, Thank you for not selling hot dogs. I don't think I could order a McWiener with a straight face.


turnipbwc

Wheeling WV

Senior Member

Joined: 05/07/2004

View Profile


Offline
Posted: 07/19/13 01:55pm Link  |  Quote  |  Print  |  Notify Moderator

D&M,
By the looks of your map you need to head west and see the rest of USA.


'95 Dodge Roadtrek 190 Versatile,
'01 Chevy Silverado 1500 4x4
'02 Subaru Outback LT


BeerCan

Sticks of Fire

Senior Member

Joined: 01/08/2013

View Profile


Offline
Posted: 07/19/13 01:56pm Link  |  Quote  |  Print  |  Notify Moderator

If the tire gets a puncture/flat and you have it plugged or patched the warranty is void. IIRC a non speed rated tires speed rating is 85mph. If that makes sense.

D & M

Laurel, MD

Senior Member

Joined: 03/04/2005

View Profile



Good Sam RV Club Member


Posted: 07/19/13 03:00pm Link  |  Quote  |  Print  |  Notify Moderator

turnipbwc wrote:

D&M,
By the looks of your map you need to head west and see the rest of USA.


Just a soon as I put in the retirement papers and move out of this little slice of heaven.

bukhrn

Lanexa, Va

Senior Member

Joined: 03/20/2005

View Profile



Good Sam RV Club Member

Offline
Posted: 07/19/13 03:13pm Link  |  Quote  |  Print  |  Notify Moderator

turnipbwc wrote:

D&M,
By the looks of your map you need to head west and see the rest of USA.
And this pertains to the OP's question..how?


2007 Forester 2941DS
2005 KIA Spectra
Zamboni, Long Haired Mini Dachshund
You can have my RV, when you pry my cold dead fingers from the Steering Wheel


nevadanick

Elko, Nevada

Senior Member

Joined: 11/25/2007

View Profile


Offline
Posted: 07/19/13 03:25pm Link  |  Quote  |  Print  |  Notify Moderator

Beercan, how do come up with that ?

tatest

Oklahoma Green Country

Senior Member

Joined: 05/14/2005

View Profile


Online
Posted: 07/19/13 04:30pm Link  |  Quote  |  Print  |  Notify Moderator

To understand what it means to be non-speed rated, you need to know what the speed rating means.

An example tire, in original undamaged condition is run under load against a test wheel, under standardized test conditions, at the rating speed, for a limited time period. Last information I've seen, the test period was 30 minutes, the test conditions much less severe with respect to heat, than typical summer highway conditions.

The DOT speed rating requirement came out of a series of tire failure accidents in the muscle car era. If a car is not limited to 85 mph (the magic number on our speedometers that was the first atttempt to fix the problem) then manufacturer has to install original equipment tires speed rated for the design top speed of the car.

This does not mean the tires can be driven all day at the speed rating, but does mean when the tires are new they should not come apart when the car is briefly driven at that speed. If the tires are damaged, the cannot be expected to perform as if undamaged, and the warranty language is the tire manufacturer's legal "out" for your expectation that it is safe to drive your car 140 mph because the tires were V rated when new.

It is not correct that unrated tires are rated for 85 mph. Certain classes of unrated tires, such as P-metric passenger car tires, are subject to testing at 85 mph, but that is not the same as a rating. Other types of highway legal tires, like trailer tires, might be tested at lower speeds.


Tom Test
Itasca Spirit 29B


Francesca Knowles

Port Hadlock, Washington

Senior Member

Joined: 02/23/2011

View Profile



Posted: 07/19/13 05:08pm Link  |  Quote  |  Print  |  Notify Moderator

I'm following pretty well, but...

I'm still unclear about the practical effect of "speed derating" due to a puncture. Clearly, the tire's O.K. to go back on the road or Bridgestone wouldn't allow it to be repaired at all, right?

But what's its top speed? Is there a minimum speed rating that ALL P's or LT's must meet in order to be "legal", and does it just drop back to that?

I'm also still unclear as to effect on warranty, if any. Nothin' in there about one puncture wiping it out but I guess that wouldn't be any big surprise!

pronstar

The LBC

Senior Member

Joined: 11/20/2007

View Profile


Offline
Posted: 07/19/13 05:28pm Link  |  Quote  |  Print  |  Notify Moderator

Maintaining/voiding a repaired tire's speed rating is dependent on the tire MFR.
Some void it, others don't.

Without digging too far into each tire MFR's website, The Tire Rack has a bunch of info all in one place:

The Tire Rack link


'07 Ram 5.9 QC/LB SRW
Full Carli Suspension
35" Toyo's | 4.56 | PacBrake


2009 Cyclone 3950 | B&W Turnover Ball & Companion | TrailAire | Duravis R250s

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 7  
Next

Open Roads Forum  >  General RVing Issues

 > Tire Speed Rating Question
Search:   Advanced Search

Search only in General RVing Issues


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:

© 2014 Woodalls | Terms & Conditions | PRIVACY POLICY | YOUR PRIVACY RIGHTS