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Old 03-29-2016, 07:40 PM   #1
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Speed Rating on ST tires.

I notice at the dealer most of the 2016 TT and 5er are coming with ST tires that are speed rated "L". The tech said that most of the inventory after 1 Dec are coming with the "L" rated tires. The tech also said there has been a "recent change" in NHTSA requirements to include speed ratings of "L" (75MPH) on all "new ST tires". That rating is not retroactive and doesn't apply to tires produced before the NHTSA changes. When the current stock is used up the unmarked "ST" tires will be history.

Can anyone in the tire business or with better connections confirm this?

Are these really upgrade construction or just "L" put on the same tires?

I have seen on Amazon ST tires rated "R" to 106 mph.

I still tow at 63 mph with my 5er with "L" rated tires because "I" feel any faster is not safe.
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Old 03-29-2016, 07:46 PM   #2
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Originally Posted by CWSWine View Post

Can anyone in the tire business or with better connections confirm this?
Correct, see post here in this thread:

http://www.forestriverforums.com/for...ml#post1138004

However, just because the tire can safely carry the load at higher speeds, doesn''t mean you should unsafely tow at higher speeds.
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Old 03-29-2016, 07:50 PM   #3
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Quote:
Originally Posted by wmtire View Post
Correct, see post here in this thread:

http://www.forestriverforums.com/for...ml#post1138004

However, just because the tire can safely carry the load at higher speeds, doesn''t mean you should unsafely tow at higher speeds.
Believe me I only tow around 63, I'm retired and not in hurry to get anywhere these days. I do feel better with the "L" tires since it gives my a safety margin and not 2 miles under the max speed ratings.

My other questions are these tires been updated or are they the same tires they have been making for years and now putting a "L" on them?
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Old 03-30-2016, 02:29 PM   #4
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The new ST tires with speed letters are a result of a tariff increase for imported tires. To avoid the increased tax assessment, tires previously manufacturer without speed restrictions displayed on their sidewalls had to start identifying the speed restrictions. The most acceptable way to do that is to manufacturer tires capable of attaining the speed restriction displayed on their sidewalls.

Because there is no speed letter for 65 MPH the ST tire manufacturers had to raise the bar. The TRA previously approved all ST tires to 65 MPH. They have now got onboard with the ST tire manufacturers and increased their approval to 81 MPH. That does not limit any individual ST tire manufacturer to that limit, it’s just the bar set by the TRA.

NHTSA certifies tires with their DOT seal of approval. Tires are independently tested, normally by a third party after initial manufacturer testing. NHTSA only steps in when serious problems occur.

J = 62
K = 68
L = 75
M = 81
N = 87
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Old 03-30-2016, 04:46 PM   #5
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Airdale, I just purchased a set of Maxxis 8008's. I'm like CWS that I rarely tow over 63, but I would like to know what the speed rating of the new tires is. I can find nothing on the sidewall of these tires that tells me the speed rating. The tires were made 6 months ago. How would I find out?
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Old 03-30-2016, 04:59 PM   #6
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Airdale, I just purchased a set of Maxxis 8008's. I'm like CWS that I rarely tow over 63, but I would like to know what the speed rating of the new tires is. I can find nothing on the sidewall of these tires that tells me the speed rating. The tires were made 6 months ago. How would I find out?
Here is a pic of a "L" tire and what it looks like. I have been told they can sell the ones with no the speed ratings till their stock is depleted then all new imported tires will have to have a speed rating. Since this happened in mid 2015 it is to bad you were no armed with this information while tire shopping.

If there isn't a letter it rated to 65 miles per hour.

PS this tire was on a small TT on a dealer lot and is 2016 model
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Old 03-30-2016, 05:13 PM   #7
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I bought some of those 106 MPH tires , did not work , at about 77 MPH my wife started hitting me with her purse , blooded my nose . Tire dealer would not give me a refund !
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Old 03-30-2016, 05:31 PM   #8
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I bought some of those 106 MPH tires , did not work , at about 77 MPH my wife started hitting me with her purse , blooded my nose . Tire dealer would not give me a refund !
My wife would hit me long before 77 miles per hour...
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Old 03-30-2016, 05:57 PM   #9
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I bought some of those 106 MPH tires , did not work , at about 77 MPH my wife started hitting me with her purse , blooded my nose . Tire dealer would not give me a refund !
Here is a "Service Description" location on your tire, plus a lot of other information.

Tire Tech Information - Sidewall Markings
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Old 03-30-2016, 06:15 PM   #10
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The load rating numbers in a service description are not the official load ratings for ST & LT tires. NHTSA allows the complete service description to be molded in the sidewalls of ST & LT tires for reference info only. Until new rules are made the Load Range lettering system is the only official load capacity for ST & LT tires.

An example of the difference can be found by looking up the service description load rating for a popular LT235/85R16E tire (3086#) and compare it to the load range letter on the tire (3042#).
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Old 03-31-2016, 01:30 AM   #11
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Originally Posted by Airdale View Post
The load rating numbers in a service description are not the official load ratings for ST & LT tires. NHTSA allows the complete service description to be molded in the sidewalls of ST & LT tires for reference info only. Until new rules are made the Load Range lettering system is the only official load capacity for ST & LT tires.

An example of the difference can be found by looking up the service description load rating for a popular LT235/85R16E tire (3086#) and compare it to the load range letter on the tire (3042#).
How and the heck is a normal Joe expected to buy tires that are safe and meets his requirements?
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Old 03-31-2016, 04:07 AM   #12
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How and the heck is a normal Joe expected to buy tires that are safe and meets his requirements?
There are 2 sure fire ways, "Flip a Coin and Pray" Youroo!!
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Old 03-31-2016, 09:12 AM   #13
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I ordered a Rockwood 2703 in April 2015 and took delivery in June 2015 and it came with Constancy 205/75/14 ST tires that were "L" rated my GVWR is 7700 lbs. I can't remember what the build date of tires were. I looked a few weeks ago so I will have to check again.
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Old 03-31-2016, 09:22 AM   #14
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A question........the G614 is touted as the 'best' alternative to the original tires on 5er's, because they are LT and have higher weight rating, but also have higher speed rating.

Yet, several online sources I find show the G614 to be rated at 62mph. That's LESS than an ST tire.

Which is correct? I find a lot of info online, most contradictory or confusing. Is there a link to show the true speed rating of these?

Also, the G114's appear to have a high speed rating, but are on larger rims. Don't know how to find out if they are simply "Replace as is" or "Plug and Play" with the bigger rim, or not........ How does one figure that out before buying?

Thanks.
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Old 03-31-2016, 09:32 AM   #15
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How and the heck is a normal Joe expected to buy tires that are safe and meets his requirements?
You need to do a comprehensive search for RV tires and you will need to know what your trailer weights are along with the placard weights listed on the trailer. You will than need to insure any tire purchase meets or exceeds these requirements. You just cannot go out and buy a Goodyear, Michelin or any other brand of tire just because other people recommend them. They must meet the needs of the trailer and support the axle loads properly.
Such as this chart by Michelin:http://www.rvtirepressure.com/assets..._Inflation.pdf
Also per the Goodyear web site the ST235/80R16 tire will not support my trailer or load. These are rated at 3,000 at 65PSI. I believe that is why they where dropped by Cedar Creek on their trailers.

Such as a in my case; the axles weights are 7,000 LBS each and the tire size is ST235/85R/16G. So you go to the tire manufacture web site and look up the tire load and inflation chart for that tire. In my case; the tire will support a load of 4,080 LBS @ 110 PSI cold in single wheel application. Any tire I purchase must meet or exceed these requirements.
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Old 03-31-2016, 09:39 AM   #16
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Originally Posted by Ejs4029 View Post
I ordered a Rockwood 2703 in April 2015 and took delivery in June 2015 and it came with Constancy 205/75/14 ST tires that were "L" rated my GVWR is 7700 lbs. I can't remember what the build date of tires were. I looked a few weeks ago so I will have to check again.
I picked up my new Mini Lite 2503S on June 6, 2015; same ST205/75R14 tires as yours. Two of them are 4414 and 2 are 4514 (i.e., 44th and 45th weeks of 2014, or end of Oct/beginning of Nov, 2014).
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Old 03-31-2016, 09:42 AM   #17
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A question........the G614 is touted as the 'best' alternative to the original tires on 5er's, because they are LT and have higher weight rating, but also have higher speed rating.

Yet, several online sources I find show the G614 to be rated at 62mph. That's LESS than an ST tire.

Which is correct? I find a lot of info online, most contradictory or confusing. Is there a link to show the true speed rating of these?

Also, the G114's appear to have a high speed rating, but are on larger rims. Don't know how to find out if they are simply "Replace as is" or "Plug and Play" with the bigger rim, or not........ How does one figure that out before buying?

Thanks.
Are you looking at the LT235/85R16 tires by Goodyear? if so per their load inflation table (chart) these are only good for a load of 3750 LBS @ 110 PSI in a single wheel application at this site: The Inflation Loading - Goodyear RV
So they will not support your Cedar Creek trailer adequately.
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Old 03-31-2016, 09:47 AM   #18
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A comprehensive search is leading me to conflicting information. That's the problem.

I can find the trailer weight. I can figure the requirements for each of 4 tires for it for weight.

What I can not find.........is the answer to some simple questions.
1) What is the speed rating of a properly inflated G614 on 16" rims, and a G114 on 17.5" rims? I find 62, 65, and 75 for the answers to speed rating for these tires on different tire sites online. Why the variance and confusion?

2) Will a G114 tire and 17.5" rim assembly fit on my trailer by simply replacing 1 for 1? If not, what do I have to do to get them installed, specifically?

I am not a gearhead. I'm an old telecom guy. I worked inside. I just need some reliable information from somewhere. Others have done this and say it's simple, and maybe it is, but I'm missing some needed initial information, somehow.

Thanks.

EDIT: Sorry, posting while you were trying to help and answer.

OK, so G614's won't work. Then why are so many folks replacing their original tires with them? And more importantly, what WILL work as a good replacement?
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Old 03-31-2016, 09:55 AM   #19
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The G614's say "Load Range G".

The original equipment tires on my trailer will be Load Range G.

So, why wouldn't G614's work??????????

See why I'm confused???
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Old 03-31-2016, 10:01 AM   #20
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I will send you a PM (private message).
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