Replacement Trailer Tires

Recently, we added the Power King Towmax STR to our trailer tire line-up that also includes the Goodyear Marathon Radial. By adding the Towmax STR tire, we now have more sizes and load ratings available for customers looking for Trailer Service tires.

Both tires are similar in their exterior features. A rounded shoulder with an internal polyester cord body provides a smooth and stable ride. Circumferential grooves provide ample water evacuation. Constant and consistent contact with the road is achieved through the solid center rib and symmetric tread design.

Goodyear Marathon Radial
Goodyear Marathon Radial
Power King Towmax STR
Power King Towmax STR

Both the Goodyear Marathon Radial and Power King Towmax STR are radial construction. We don't offer bias ply lines. Additionally, Tire Rack only offers modern tire sizing in the form "ST205/75R15."  If you have an older tire with a classic size such as 6.50-15, you'll need to convert to a modern size first. To make the conversion simple, take a look at this table.

Special purpose trailer tires aren't intended to be used on cars or light trucks and are not UTQG rated. Your trailer will be more stable and pull better on tires designed specifically for trailer use. Since Special Trailer tires are constructed with heavier duty materials, they are tougher than typical passenger vehicle tires. This is a plus because trailer suspension systems are generally stiffer and less sophisticated than automotive suspension systems. For more information on a trailer tire's design, read "Trailer Tires vs. Passenger Vehicle Tires."


Tuesday, January 22, 2013 by dennis

What are the prices of the St205/75R15 tires? This is for a 19'camper trailer I'm intending to sell fall of 2013.
Tuesday, January 22, 2013 by Hunter

Hi Dennis,
Load Range C(1820 pounds per tire) are $87 each and Load Range D (2150 pounds per tire) are $92 each. Prices are plus shipping
Wednesday, February 6, 2013 by Chris

I'm having trouble finding a replacement trailer tire. Printed on one tire is 145R13 and the other 155R13. I can't find these specific tires. Is there an equivilant?
Wednesday, February 6, 2013 by Hunter

155R13 is the same as 155/80R13. We do have a couple car tire options in that size at
Friday, March 22, 2013 by Gage Smith

I have a 5th wheel toy hauler and there are times when I will be hauling off pavement..never the really rough stuff but 20 miles on gravel roads is not unheard of.
I want the best tire possible...changing tires has a very very low fun factor.
Monday, March 25, 2013 by Hunter

Hi Gage,
The trailer tires covered in this blog are the only options we have for dedicated trailer service. Youcould possibly explore LT tires, but that may dependent on the size you need.
Saturday, April 20, 2013 by David

I have a trailer with tires that I believe will not be capable of towing the load that I need. Printed on the sidewall of the trailer tires is 4.80 - 8.00 and B Load Range at 590 lbs per tire. My load will roughly be 1500lbs (It's a two wheel trailer btw).
Friday, May 31, 2013 by scott

i have a '85 fleetwood 'resort' 24ft long ..the tire size says 7.8x15 what will fit? i need 4 tires the ones on it are cracked on the sidewall. any help is greatful..thank you for your time
Monday, June 3, 2013 by Hunter

Hi Scott,
We are having trouble finding any reference to that tire size. If you could email a picture to me at I will try move forward with a suggestion.
Thursday, June 13, 2013 by Tim

I am looking for 225 /75R15 for a flatbed trailer that will hold a good weight load. Any suggestions???
Thursday, June 13, 2013 by Hunter

Both Goodyear and Powerking mentioned above offer trailer tire in your size. In the load range D they carry 2540 pounds per tire
Wednesday, August 13, 2014 by Adrian

I Have a pilgrim internanional camper this was sold with 14 inches tires at 50 psi.the owner before me change them to 15 inches rim and 20575R15. My question is how much air should i put on them?
Friday, August 15, 2014 by hunter

Hi Adrian,
You should continue to run 50 psi assuming you have ST trailer tire and it says on the sidewall it can handle 50 psi.
Friday, June 5, 2015 by Dan Doherty

I need price for 4 camper trailer tires. Size ST205/75R15. The camper trailer is 33' long. GVWR 8079 /3664.6 lbs./kg. . The dry weight rate 6129/2780.1 lbs./kg.
I would want at least an 8 ply tire
Tuesday, June 16, 2015 by hunter

Hi Dan,
The Power King Tow Max is offered in Load Range D which is 8 ply equivalent. They are rated to carry 2150 pounds each. They are currently priced at $70.82 each. This is subject to change without notice. You should check our website for current pricing
Monday, August 3, 2015 by Steve Buha

Have a 2012 521Z Ranger. Want to replace Carlisle ST215/TSR 15 LR C 4 PLY.
What brand & model are the best and most dependable to fit on my rims? Cost is secondary to safety & reliability.
Wednesday, August 5, 2015 by hunter

Hi Steve
I do not see any significant difference in the feedback we have been getting. I personally went with the Goodyear on my camper simply because it is a Goodyear.

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