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Old 04-03-2016, 11:04 AM   #31
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mnoland30: In post #25 you said M rating, 81mph. In the next post you say M rating 65mph. Which is it?
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Old 04-03-2016, 11:33 AM   #32
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Originally Posted by emm-dee View Post
The CC model referenced has a GW of 16,407 and pin weight of 2,407, so wouldn't the total load on the tires be 14,000? 3,750 * 4 tires would be 15,000 so it appears the 614 would meet requirements.
That's correct. And the axles are only good to 14k. So there's no reason it won't be ok.

Not sure what Jim is trying to prove, that's why I asked why he was PM'ing rather than posting.

On another note we all know posted "empty" pin weights are light to begin with and will increase as the trailer gets loaded. I doubt the axles (and tires) will ever actually see 14K.
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Old 04-03-2016, 11:49 AM   #33
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Quote:
Originally Posted by mnoland30 View Post
I just checked eTrailers website, and they still show 65 mph rating on the M rated Load range D ST215/75/R14 tires I purchased. They aren't too bright, but they sell good tires.
You have to check your tires for the speed ratings. If your tires has the "M" it is speed rated to 81 MPH if the "M" isn't there they are rated to 65 mph. So they could either 81 mph or 65 mph tires and have the same part number. This is a recent change to the importing rules.

Here is what the markings look like, you should have a "M" where the "L" is on this tire.
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Old 04-08-2016, 04:49 PM   #34
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Originally Posted by CWSWine View Post
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.
Changes in tire construction are most likely required to allow a tire to meet the speed ratings higher than 65 MAX. No "Speed Symbol" = 65 MAX which is like the red line on your tach. It is possible to rev your engine faster but you are consuming tire life. When you do damage to a tire with excess load, excess speed, excess heat or low pressure the damage does not repair itself it just gets worse.

No matter what speed symbol is on a tire it is recommended that you never tow faster than 75 with lower speeds being safer.
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Old 04-08-2016, 05:08 PM   #35
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All these ratings are to protect the manufactures . There is always some wiggle room. Doesn`t matter weather its tires, tow rating , hitch capacities , axle ratings and the list can go on and on.
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Old 04-08-2016, 05:18 PM   #36
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Originally Posted by Airdale View Post
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
Sorry info not quite accurate.
NHTSA does not certify tires for performance. The "DOT" symbol on a tire sidewall is used by the tire company to indicate that the tire company certifies that the tire will meet all NHTSA regulations. "DOT" is not a "seal of approval"

Tires MAY be tested by independent 3rd party companies but only when someone pays for such a test. I know of no ongoing program to do such testing as it is expensive.

Also TRA does not "approve" tires. They only publish industry standards. NHTSA in their regulations use the TRA standards when specifying the dimensions, loads and inflations a tire company is to use when certifying a tire's performance.
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Old 04-09-2016, 12:18 AM   #37
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Originally Posted by Tireman9 View Post
Sorry info not quite accurate.
NHTSA does not certify tires for performance. The "DOT" symbol on a tire sidewall is used by the tire company to indicate that the tire company certifies that the tire will meet all NHTSA regulations. "DOT" is not a "seal of approval"
How about I word it like this?::: The "DOT" symbol certifies the tire manufacturer's compliance with the U.S. Department of Transportation tire safety standards.
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Old 04-09-2016, 09:54 AM   #38
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So exactly who is this TRA guy y'all keep mentioning?
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Old 04-09-2016, 03:15 PM   #39
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How about I word it like this?::: The "DOT" symbol certifies the tire manufacturer's compliance with the U.S. Department of Transportation tire safety standards.
I guess that's OK as long as people realize that only the tire manufacture is "certifying". Others just publish standards and regulations.
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Old 04-09-2016, 03:23 PM   #40
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So exactly who is this TRA guy y'all keep mentioning?
US Tire & Rim Association. publishes the standards book with fitment dimensions for tires, wheels and valve components.
This is to ensure that a 15" tire will fit a 15" wheel and the hole in the wheel is correct for the valves that are to be used. Also to provide some standardization in dimensions of tires.

Time was when each tire company followed their own guides so if you had a 7.50-15 from one company t might or might not be the same size and load capacity as a 7.50-15 from another company.

Note the "fitment" is not a list of what tires come on what vehicles.
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