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

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