Goodyear Marathon Radial vs. Power King Towmax STR Trailer Tires

Thursday, April 26, 2012 by Gary Stanley

The nice weather is here and many trailers are hitting the road with spring projects. Are your trailer tires in need of replacing? Until recently, Tire Rack only carried the Goodyear Marathon Radial trailer tire. For information on this Trailer Service tire, read my previous blog post, "Trailer Tires are Available at Tire Rack."
 

We now offer a few more tires in this performance category, including our newest option, the Power King Towmax STR. Like the Goodyear Marathon Radial, the Towmax STR tire is designed for use on campers, boat trailers, fifth wheel trailers and even some larger utility trailers. The tires also share some common design features, such as a symmetric tread pattern and twin steel belts with reinforced nylon caps to help increase overall durability. 
 

Unlike the Marathon Radial, the Towmax STR is produced in the popular 235/85R16 load range E size that many full-size trailers use. Another unique application is the 225/75R15 size that's available in an E load range versus only a D load range with the Goodyear Marathon Radial. 

 

Listed below are the available sizes for the Power King Towmax STR trailer tire:

Trailers will be more stable and pull better on tires designed specifically for trailer use. Special Trailer tires are constructed with heavier duty materials and are tougher than typical passenger vehicle tires. To gain a better understanding of the driving requirements of Special Trailer tires, read "Trailer Tires vs. Passenger Vehicle Tires."

Comments on Goodyear Marathon Radial vs. Power King Towmax STR Trailer Tires

Thursday, October 18, 2012 by Trevor:
Are the Power King Towmax STR Trailer tires a Radial tire?
Thursday, October 18, 2012 by Gary:
Trevor,

Yes, all of the Power King Towmax STR Trailer tires are radial tires.
Friday, October 26, 2012 by Ken Foust:
I have a brand new power king spare. I bought my unit in 2007. Is the trie still good to go??
Friday, October 26, 2012 by Gary:
Ken,

I would feel okay using that spare given that has been protected from sunlight and the elements for most (if not all) of its life.
Wednesday, February 20, 2013 by JIM:
What country are the Power King tires made in ?
Wednesday, February 27, 2013 by Jim :
I have a new trailer with two axl;es and 215 75 R 14 tires.
I would like to upgrade to an E load rating. There isn't much extra room in the wheel wells for a 15" tire.
Can I get a 14" E rated tire? If not why not? Many trailers use the 215 14" tire and they are almost overloaded empty. This needs to be rectified.
Wednesday, February 27, 2013 by Gary:
Jim,

I'm sorry, I have not heard of any E load range 14" tires, sorry.
Wednesday, May 22, 2013 by Brian:
We have a 5th wheel trailer that weighs 12k lbs loaded, with about 2,000 of that on the pin. So, 10,000 lbs sitting on 4 tires. The OE tires were 285-50-20 on American Dominator wheels. The first owner replaced these with 275-65-20 Load Range E tires. The problem is that the wheel wells are not large enough to accomodate the tall profile and they rub. I am looking for Load Range E tires in the original 285-50-20 size but cannot find any,only XL Extra Load. Is XL a high enough load rating for the trailer? Some people with this model trailer have "downgraded" to the base 16" trailer tire in a Load Range E. I am tempted. Am I ok with a set of 285-50-20 XL's? or are there reasons the 16" combos would be better?
Thursday, May 23, 2013 by Gary:
Brian,

I do not show any more XL tires available in 285/50R20. Most other tires in this size carry less than 2500lbs per tire so I could not recommend them. There are still many load range E tires made in 16" sizing, so you may want to consider going that route, or modifying your fenders to help with the rubbing on your current size.
Tuesday, June 4, 2013 by Stan:
what is the speed rating of the ST205/75R15D ?
Tuesday, June 4, 2013 by Gary:
Stan,

Industry standards dictate tires with the ST designation are speed rated to 65 MPH.
Monday, July 15, 2013 by Keith:
What country are the Power King tires made in ?
Monday, July 15, 2013 by Gary:
Keith,

Like the Goodyear Marathon Radial Trailer tires, the Power King TowMax STR tires are also made in China.

Tires http://www.tirerack.com/tires/index.jsp?affiliate=FH8
Tuesday, August 13, 2013 by Mary:
Looking to replace my current horse trailer Power King tires but not sure if they are D or E rated.
Tuesday, August 13, 2013 by Gary:
Mary,

What is the maximum inflation pressure listed on the tire sidewall?
Monday, September 9, 2013 by joe:
I currently am looking for new trailer tires for a 10,000lbs trailer, it mainly pulls a 7,000lbs tractor. The tires currently use a st225/75r15 D rating, I would like to up grade to load E. My question is will the increase in max pressure while inflation cause structural problems to the rims? or it ok because it is jumping from an inflation of 65psi to 80psi
Monday, September 9, 2013 by Gary:
Joe,

Increasing the inflation pressure to 80psi with a load range E tire should not cause any structural problems for the wheels.
Friday, November 8, 2013 by Nancy:
I currently have Good Year Marathon 225 75 15 D, ST tires on my horse trailer. I would like to go to a E, is that Ok. Also which is a better tire the Marathon or Maxxis?
Monday, November 11, 2013 by Gary:
Nancy,

Goodyear does not make the Marathon in a load range E in 225/75R15, but the Power King Towmax STR tires are made in that size in an E load range.

Tires http://www.tirerack.com/tires/index.jsp?affiliate=FH8
Monday, May 19, 2014 by Chuck:
Wanting to go from a 15" to a 16" on my rv.Im getting bad mpg on the 15s thinking going to 16" as the 15" are getting 733 rev. per mile but my truck tires are getting 654 rev per mile.Im thinkin the trailer is fighting to keep up.What do you think will the 16" E rated tires make a big difference in mpg over the 15" D rated tire?
Tuesday, May 20, 2014 by Gary:
Chuck,

I'm sorry, we have no data on the effects of this change on MPG
Friday, May 23, 2014 by Resa:
I have a 25 ft rv with tire size St225/75R15 but I do not see a load size and have no idea what the trailer weighs. How do I know if I need a D or E load tire? Currently it has Goodyear but woould the Power King Towmax be a good tire for this RV. I pull it with a dual wheel crew cab. I live in this unit also.
Wednesday, May 28, 2014 by John:
I have a fifth wheel toy hauler with power king tow max str tires that are two years old. I have had three blow outs in three months on two different trips. GVWR/PNBV is 16,500 the trailer empty is 12,180. Tires came with the trailer-2012. I normally tow at 15,000. Are these the wrong tires, why do they keep blowing.
Wednesday, May 28, 2014 by Gary:
Rosa,

What is the maximum inflation pressure that is listed on the sidewall of your current tires?
Sunday, July 20, 2014 by Chuck:
This is my first set of Power King Towmax STR ST235/80R16, that came on my 20013 5 th wheel, less then 1000 miles on them they are junk! tread coming apart, needles to say I will be putting a new set of Goodyear Marathon Radial back on my rv, never had any issues with them ever!
Thursday, July 24, 2014 by Alex:
I have been reading about the ST tires, and the speed rating on the STs are quite a bit lower than speed rating on an LT tire. I pull a horse trailer with 235/85/16. I generally don't go much over 65mph, but I do on occasion. How important is the speed rating on a tire? I have been using LT tires on it for years, and I do want the best tire for it, but I don't want a tire that can't handle some speed when I need it. Thank you.
Friday, July 25, 2014 by Bob:
You stated that trailer tires ST are rated at 65mph, the power king info says they are STR rated which is above the 65mph ST rating. Which is it? thanks,Bob
Monday, July 28, 2014 by Gage:
Are the tow max and the marathon made by the same company but just have different branding?
Wednesday, July 30, 2014 by Anthony:
A quick google search shows the Power King Towmax having a large number of blow outs with experienced Rv'ers. Gary you did not respond or have any suggestions for John with the 3 blow outs?

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