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Old 04-07-2016, 12:05 PM   #11
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TRA has set a new 81 MPH speed rating for ST tires manufactured after xxxx date without a speed letter. Older unmarked tires are still 65 MPH.

Tire manufacturers are not required to divulge manufacturing components of tires other than what is required by DOT to be on each tire's sidewall. They do have to certify to NHTSA that a speed rating is valid and testable.
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Old 04-07-2016, 01:37 PM   #12
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Originally Posted by dustman_stx View Post
That is likely true. Anyone want to make a bet that they didn't make any changes at all to the tires to increase the speed rating. My money is on the 75mph tires being identical to the 65mph tires.
I'd say you are correct. I recently purchased Goodyear Marathons. Goodyear has a Public Service Bulletin that indicates you can increase the tire pressure 10 psi over the TT's sticker to increase the speed range to 66 - 75 mph.
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Old 04-07-2016, 07:20 PM   #13
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Since 2000, the NHTSA has required that all passenger car tires, as well as, all pneumatic mfg tires, have the load range, max cold tire inflation pressure, speed rating etc...stamped on the sidewall of all tires sold in the United States. I looked it up!
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Old 04-07-2016, 09:28 PM   #14
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Originally Posted by checkmate99 View Post
Since 2000, the NHTSA has required that all passenger car tires, as well as, all pneumatic mfg tires, have the load range, max cold tire inflation pressure, speed rating etc...stamped on the sidewall of all tires sold in the United States. I looked it up!
Load range is not applicable to passenger tires.

The current description method for speed ratings has been used since 1971.

Speed letters have not and are still not mandatory for ST tires. The current adaption of service descriptions including speed letters for ST tires has been forced on those tires being imported. To pass customs without having to pay an increased tariff most ST tires must now have speed letters.

The official load capacity medium for ST and LT tires is the load range letters. They are also official for medium to heavy duty truck tires.

Passenger tires load capacity is presented on their sidewalls as a service description. Something like 100Q where the 100 will lead you to a chart depicting its load capacity and the "Q" is its speed restriction. Passenger tires also have a grading system called "Uniform Tire Quality Grade (UTQG) Standards".

The DOT allows the use of service descriptions on ST tires although they are not the official method used to determine their load capacity.
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Old 04-07-2016, 10:11 PM   #15
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Originally Posted by Airdale View Post
Load range is not applicable to passenger tires.

The current description method for speed ratings has been used since 1971.

Speed letters have not and are still not mandatory for ST tires. The current adaption of service descriptions including speed letters for ST tires has been forced on those tires being imported. To pass customs without having to pay an increased tariff most ST tires must now have speed letters.

The official load capacity medium for ST and LT tires is the load range letters. They are also official for medium to heavy duty truck tires.

Passenger tires load capacity is presented on their sidewalls as a service description. Something like 100Q where the 100 will lead you to a chart depicting its load capacity and the "Q" is its speed restriction. Passenger tires also have a grading system called "Uniform Tire Quality Grade (UTQG) Standards".

The DOT allows the use of service descriptions on ST tires although they are not the official method used to determine their load capacity.
What I said.....
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Old 04-07-2016, 10:33 PM   #16
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I just replaced a set of Constancy 188 tires that came new on my 2015 fiver. I sold the set for $200 on Craigslist to a guy who wanted them for his equipment trailer. I'll wager that he paid me more for them than FR paid for them as oem tires.
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Old 04-08-2016, 08:53 AM   #17
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I've read tons of talk about FR (and pretty much all other RV manufacturers) using cheap "China Bombs" on new trailers. It sounds like the #1 recommended tire replacement is Goodyear Marathon Radials. What confuses me is that Goodyear Marathons are also made in China. What's the deal?
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Old 04-08-2016, 09:20 AM   #18
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Originally Posted by gresper View Post
My 2016 Coachmen Freedom Express 301BLDS came from the factory with Constancy LY188 ST225/75R15 tires installed. They do have both Load Rating and Speed Rating markings:

Speed Rating "L" (75MPH/120km/h MAX.)
Load Range D
Max Load Single 1150 kg (2540 lbs) at 450 kPa (65 psi)
Max Load Dual 1000 kg (2200 lbs) at 450 kPa (65 psi)
[
Same here
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Old 04-08-2016, 09:47 AM   #19
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The Constancy 188's have a huge reputation for blowing out at hwy speeds. Never take them over 65. ST tires lose a third of their strength at 2 years of age whether they are in service or not. I wasn't waiting for a cheap ST tire to blow and take half the kitchen slide plumbing with it. Forum research led me to Maxxis tires which are not made in China. Mine were made in Thailand. Is that better? I dunno,....time will tell. I would have liked to install G614's, but ran into rim figment issues that became difficult to overcome. So, I'll be watching my new Maxxis tires closely to see how they hold up. I think it was Herk who suggested the Maxxis and use the savings to install a tpms system. After thinking about that for a day or two, I concluded it was a great suggestion, so that's what I did. Time will tell. Watch your tires closely no matter which brand. Blowouts can prove to be costly.
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Old 04-12-2016, 11:54 AM   #20
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I plan to go with Maxxis too. Onlinetires.com list them as Q rated but Maxxis.com just says it is a "high speed radial".

I am waiting to see if the rating is actually listed on the tire but haven't seen anyone comment on that yet.
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