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Old 07-14-2011, 10:15 AM   #1
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Tire Choices: I'm confused!

Good morning, All!

Currently running 3507 (week 35, 2007) Carlisle "AQ" (Chinese) ST205-75R14's on my signature TT. The tires were "new" on the TT, delivered new in March 2008, and are starting to show signs of wear. I use a TPMS, and I'm religious about making sure that all 10 tires, TT and TV, are at the correct pressure, especially when towing! I've probably put about 5000 miles on these tires, and it was likely towed from the factory, another 1500 miles, maybe?

I've been reading the many and various threads related to these tires, and the possible replacements. I've looked at both the Marathon's and the Maxxi's, in the comparable ST size, and both are still only load range C. I've also read some of the arguements pro and con to switching to an LT tire to get a higher load range, and hence, a higher allowable max speed. (I typically run between 65 snd 70 mph on open road. Not comfortable towing at faster than 70 mph.)

So what's the conclusion? I'M CONFUSED!!! That's the conclusion!

It's not one of the "heavyweight" toy haulers or 5ers that typically get the larger wheels and heavier rated tires. Is there an ST in that size anywhere with a higher rating? What do the tire guru's on this site recommend for a replacement?
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Old 07-14-2011, 11:48 AM   #2
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Yours came with a "c"--------

Your RV came with a "C" rated tire, go up one grade to a "D" rated tire, you will not be sorry. Try the Good Year Marathons, I do not think you can go wrong.

My Rockwood 8285WS 5 ver came with the "C" rated tires, I just switched to "D" rated tires for a 6,000 mile trip.

I could tell the difference just pulling my RV home from the place where I purchased the tires, the "C"'s that came off carried a tire pressure of 50 PSI, the new "D" rated tires carry a tire pressure of 65 PSI.

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Old 07-14-2011, 12:41 PM   #3
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As best I can tell, the Marathons only come in a "C" rating in my size. I'd have to up-size rims to go to a bigger tire, and I'm not sure that the clearance is there to do that.
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Old 07-14-2011, 01:01 PM   #4
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Originally Posted by Fire Instructor View Post
As best I can tell, the Marathons only come in a "C" rating in my size. I'd have to up-size rims to go to a bigger tire, and I'm not sure that the clearance is there to do that.
I have US made (Gadsden Alabama) Goodyear Marathon STs in D size on my fiver right now. Don't know about 14 inch tires though.
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Old 07-14-2011, 01:23 PM   #5
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Looking at this Goodyear link: Goodyear RV Tires, it apears that the 14" Marathon tires only come in "C" range.
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Old 07-14-2011, 04:56 PM   #6
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Fire Instructor, I can understand your concern with not maxing out a C rated Marathon. But even if you load your trailer to the listed maximum of 6580, 6000 lbs. of that weight is split up between 2 axles (580 lbs on the tongue), so each axle is carrying 3000 lbs. That is probably the axle rating. The combined weight rating of your 2 tires is 3520 lbs, so you have some leeway of 250 lbs. per tire. Yes, that doesn't seem like a lot, but I betcha you won't even have that kinda weight in your trailer.

My trailer is rated to carry 3500 lbs. on each axle, so the C rated tires are getting a little closer to the maximum weight rating. But in reality, I only have 4800 lbs. split between the axles ready to camp, so I am way under the maximum rating.

On a different note, when I had my Trailmanor I did go to 15" tires, but still stayed with the C rated. That was a single axle trailer, and I was right around 3400 lbs. on the axle, giving only about 50 lbs. leeway on each tire. The earlier Trailmanors were famous for tire failure, and now Trailmanor puts 15" tires on their trailers.
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Old 07-14-2011, 09:04 PM   #7
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My tires are on 15" rims, when I went to the tire dealer a few weeks ago to buy new tires I asked for LT's instead of ST's and he was telling me that in a 15" tire the options for LT's would actually be a down grade in ply rating and in load rating, he highly recommended staying with the ST's, even though he would make more money if he sold the LT's to me.
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Old 07-14-2011, 10:23 PM   #8
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I can understand your concern with not maxing out a C rated Marathon. But even if you load your trailer to the listed maximum of 6580, 6000 lbs. of that weight is split up between 2 axles (580 lbs on the tongue), so each axle is carrying 3000 lbs.
My concern for the C Rating is more the 65 MPH max, vs the extra strength that the D's provide. I often run a about 70mph, just to stay in the flow of traffiic, and with tires that max at 65mph, I'd be more comfortable doing it with a "stronger" tire.
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Old 07-15-2011, 10:58 AM   #9
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My concern for the C Rating is more the 65 MPH max, vs the extra strength that the D's provide. I often run a about 70mph, just to stay in the flow of traffiic, and with tires that max at 65mph, I'd be more comfortable doing it with a "stronger" tire.
I understand where you are coming from. Occasionally I will have to do 70 to get back into traffic. And our dear governor decided to raise the speed limit in Virginia to 70.....bad idea. I still do 65.....the traffic behind me will just have to go around.
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Old 07-15-2011, 01:38 PM   #10
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Try this tire.

Kumho Radial 857

It is D rated and also rated for 99 mph.

You would need to do the 195 size to get the same rolling circumference (it is aspect ratio 82 instead of 75). But your overall load rating will still be up and you won't have to worry about the occasional 70 mph; at least from the tires . . .
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