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Old 07-19-2013, 01:46 PM   #1
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Tires

On our 2012 Cherokee i have 205/75D14/C Trail Express tires can some one
tell me the speed rating.The camper weighs 3500Lbs empty,there is only
about one thousand miles on the tires.I think by next year i will need new ones,is it better to go to 15 inch &bigger than 205, radial tires or bias ply.
I recently had all 4 balanced there doesent look like a whole bunch of
thread left.We are going camping next week about 200 mile round trip
on the interstate the speed limit is 55 60 65 70 in diffrent spots.
Thank you for any help on this.
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Old 07-19-2013, 02:00 PM   #2
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Rated to 65mph. I had 14" trail express tires in my old grey wolf also, and had two replaced under warranty with only a couple thousand miles in them. I would look for another brand, and there are plenty of good threads on here on tires. Most seem to like maxxis brand, and I think its much easier to find 15" tires then 14's. If you can afford and are keeping the trailer for more than a year, I say find some good 15" tire/wheels
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Old 07-19-2013, 02:03 PM   #3
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You probably don't have the room to go to 15 inch tires, and since your camper isn't that heavy, there should be no need to.
If there isn't much tread left on your tires, which is shocking if you only have about a thousand miles on them, get them changed asap. And you may have an alignment issue, so I would have a tire shop check it out to see what they say.
But you should be ok for a 200 mile trip, but no need to rush, so keep the speed down. Not sure what the speed rating would be.

If you check out the Maxxis chart, you will see they have a C-rated tire in your size that will carry 1760 lbs;
http://www.maxxis.com/Repository/Files/m8008load.pdf

Kumho also has good tires. Both are high-speed rated.
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Old 07-19-2013, 02:16 PM   #4
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Kumho has a 195/14 that has about the same diameter, but can carry 2094 lbs, plus a speed rating of 106 mph.
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Old 07-19-2013, 02:19 PM   #5
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With only 1000 miles on the trailer and not much tread left, I would be taking it to a shop to have the axles checked for alignment or having bent axles etc. That is very abnormal wear. ST tires (trailer) are rated at 65 mph max.

Good Year Marathons are as good as any and there are dealers all over the US. Others like Maxxis and other brands. I've run GY Marathons on 9 different rv trailers and several racecar trailers and never had a blowout or flat in 38 yrs.
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Old 07-19-2013, 02:39 PM   #6
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Originally Posted by jtstromsburg View Post
Rated to 65mph.

I think it would be more accurate to say that trailer tires are rated "at" 65 mph, not that they are rated "to" 65 mph. Those ratings are to determine comparable loads at a standard speed.

Kumho has speed ratings of Q and R on their trailer tires, which is for 99 and 106 mph respectively, with obviously reduced load.

Maxxis has stated that their trailer tires are good for 99 mph, or a Q rating.

I asked the guys at Tirerack what Goodyear had to say, and they replied that they wouldn't put a speed rating on them. So I would probably limit them to 65 mph if I had them on my camper.

But I don't drive over 65 mph very often anyway, so am not all that concerned about that particular issue.
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Old 07-19-2013, 03:01 PM   #7
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According to Maxxis documentation, all their ST tires are 65 mph max.
Size Max speed
ST205/75R14 65
ST205/75R15 65
ST215/75R14 65
ST225/75R15 65
ST175/80R13 65
ST185/80R13 65
ST235/80R16 65
Attached Files
File Type: pdf Maxxis st tires.pdf (142.2 KB, 53 views)
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Old 07-19-2013, 03:04 PM   #8
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...Kumho has speed ratings of Q and R on their trailer tires, which is for 99 and 106 mph respectively, with obviously reduced load.
Maxxis has stated that their trailer tires are good for 99 mph, or a Q rating.
Actual documentation of these statements?
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Old 07-19-2013, 03:16 PM   #9
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Quote:
Originally Posted by OldCoot View Post
According to Maxxis documentation, all their ST tires are 65 mph max.
Size Max speed
ST205/75R14 65
ST205/75R15 65
ST215/75R14 65
ST225/75R15 65
ST175/80R13 65
ST185/80R13 65
ST235/80R16 65
Yes, but a dealer inquiry indicated differently. Look for a post by wmtire here about a week ago. Essentially, if you are running at less than the max load and inflate against the inflation table for the psi to load, you can increase the psi (without exceeding wheel or tire's maximum cold pressure) to gain an increase in speed rating.
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Old 07-19-2013, 03:24 PM   #10
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Yes, but a dealer inquiry indicated differently. Look for a post by wmtire here about a week ago. Essentially, if you are running at less than the max load and inflate against the inflation table for the psi to load, you can increase the psi (without exceeding wheel or tire's maximum cold pressure) to gain an increase in speed rating.
I read wmtire's post, I was just furnishing Maxxis' own publications.

I know, it's on the internet so it has to be true. Just kidding.
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Old 07-19-2013, 03:30 PM   #11
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I read wmtire's post, I was just furnishing Maxxis' own publications.

I know, it's on the internet so it has to be true. Just kidding.
I understand what you're saying. But, given that Goodyear published guidance saying just about the same thing; I'm willing to believe it.
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Old 07-19-2013, 03:37 PM   #12
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I too, had the 14 inch tires on my Grey Wolf. Last November the passenger fwd tire decided to modify the wheel well (blowout that I didn’t catch till after unknown miles), I get fed up and after saving the cash, I upgraded to 15’s. I went with E rated Carlisle trailer tires. Over kill? You bet. I only have a thousand miles on them so can’t make a reliability statement but I’m a lot more confident towing now. Oh, they fit with plenty o room so not to worry about that.
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Old 07-19-2013, 03:43 PM   #13
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Originally Posted by ependydad View Post
Yes, but a dealer inquiry indicated differently. Look for a post by wmtire here about a week ago. Essentially, if you are running at less than the max load and inflate against the inflation table for the psi to load, you can increase the psi (without exceeding wheel or tire's maximum cold pressure) to gain an increase in speed rating.

For those who haven't seen it;

The spped rating on for the Maxxis M8008 ST Radial is "Q", which is 99 MPH. However, according to the Tire and Rim Association the inflation pressures and load specifications in general for all ST Radial trailer tires, regardless of the manufacturer, are designed and rated at 65 MPH. If the speed is higher than 65 MPH, the pressure and load need to be adjusted according to the following guidelines:
From 66 to 75 MPH – the tire inflation pressure needs to increase 10 PSI (not to exceed the maximum PSI the tire is rated for) but requires no load adjustment.
From 76 to 85 MPH – the tire inflation pressure needs to increase 10 PSI (not to exceed the maximum PSI the tire is rated for) and load should be reduced by 10%.
We hope this information is helpful. Thanks for your email and interest in Maxxis Tires.
Best Regards,
The Maxxis Support Team
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Old 07-19-2013, 04:04 PM   #14
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I just had a set of Maxxsis ST225/75R 15 E rated tires Installed On our Wildcat 29RLBS.
Over the 8 years we owned this unit I have had 1 GY marathon to blow out 2 more to separate and 2 Maxxis to separate.
I always at the first of the season and before long trips (500+ miles 1 way) I jack up each wheel and check for nails, rocks, separated and out of round tires
I try not to travel over 65 miles per hour.
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Old 07-19-2013, 04:10 PM   #15
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I just had a set of Maxxsis ST225/75R 15 E rated tires Installed On our Wildcat 29RLBS.
Over the 8 years we owned this unit I have had 1 GY marathon to blow out 2 more to separate and 2 Maxxis to separate.
I always at the first of the season and before long trips (500+ miles 1 way) I jack up each wheel and check for nails, rocks, separated and out of round tires
I try not to travel over 65 miles per hour.
Were the Maxxis tires that separated load range E?
That sure is a lot of tire problems, do you put on a lot of miles?
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Old 07-19-2013, 04:35 PM   #16
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Yes they were E range. They were over five years old. they were just out of warranty which is 5 Years. I have I think about 9,000 miles total on the 5th wheel
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Old 07-19-2013, 04:44 PM   #17
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Yes they were E range. They were over five years old. they were just out of warranty which is 5 Years. I have I think about 9,000 miles total on the 5th wheel

That many tires in 9000 miles, and you have no odd tire wear or axle issues?
Are the tires always exposed to the sun?
There has to be something causing them to fail.
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Old 07-19-2013, 04:51 PM   #18
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Don't know about the Maxxis speed rating but I have the Kumho's and they are rated Q or R. 99mph+. If you go with a higher load rated tire make sure your rim can handle the increased pressure. From 50 psi to 65 psi is a 30% increase. Kumho is not an ST tire so a 195/14 is the replacement for an ST 205/75/14.
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Old 07-19-2013, 05:19 PM   #19
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Doubtful that 4 tread separations is due to anything but construction or hitting holes in the highways. Sunlight usually damages the sidewalls first by weather checking.
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Old 07-19-2013, 10:20 PM   #20
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That many tires in 9000 miles, and you have no odd tire wear or axle issues?
Are the tires always exposed to the sun?
There has to be something causing them to fail.
The first GY that blew out the whole tread came off like a donut left both side walls on the rim. The next 2 GYs had a baseball size bubble on the sidewall just off from the tread. The 2 Maxxis separated in the first large grove in the tread. One had about 12" split in the grove still holding air. The other was raise in the tread all the way around. The tread was not flat but rounded. This tire was still holding air.
Two of the tires that was replaced that there was no problems with them.
they were GY and one was 9 years old and the other one was 6 years old by the date on the tire.
Yes I cover them when it is parked at home. Tread wear, there is no problem with the wear.
The OEM tires were GY and made in the USA
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