Difference Between Trailer Tire Sizes ST205/75R15 and ST225/75R15

Question

Question:

What are the key differences in these two tire sizes ST205/75R15 vs ST225/75R15 and do they require different wheels. Thanks

asked by: Mike N

1

Helpful Expert Reply:

The two sizes you mentioned are pretty similar and fit many of the same 15 inch wheels. The 205/75-15 fits rim widths of 5 inch to 6-1/2 inch whereas the 225/75-15 fits widths that are 5 inch to 6 inch.

The 205 is 27.1 inches tall and the 225 is 28.4 inches tall. The 225 has higher capacities available for it as well.

Generally people go to the bigger size when they need more capacity than what the 205 offers. In that size the part # LHWL304 is our best option as it has a 75 mph speed rating and a 2 year road assistance program. It's weight capacity is 2,830 lbs at 80 psi.

expert reply by: Jameson C

1

Tom

3/20/2024

Are you saying if my trailer says st205 I can put st225 on it.

Reply

Jameson C.

3/28/2024

@Tom Yep.

Reply

Tery

4/22/2024

@JamesonC What if the other way around? The tires on my 5th wheel are 225/75R/15 the ones I'm thinking about are 205/75R/15 Would that be ok?

Reply

Jameson C.

4/22/2024

@Tery Yes it will still work. The two sizes are very similar.

Reply

Naz L.

3/18/2020

What is the difference between a D15 and a R15 tire??Both are ST205 but one is R15 and the other is D15 is it safe to run one on one side and one on the other. Please help!!

Reply

Chris R.

3/18/2020

The "D" that you see indicates a bias ply tire (the D is for directional ply) and the "R" is used on radial ply tires. Unless the majority of your towing takes place off-road or on bumpy terrain, radial tires are the way to go. They perform much better on the highway and tend to run a bit cooler. I don't recommend using one of each on an axle, as it will likely lead to uneven tread wear and a shortened lifespan on the tire(s).

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Naz L.

5/12/2020

@ChrisR The trailer is a duel axle car hauler. As of now, I have the two D's on the passenger side and the two R's on the drivers side. Since I was sold the tire and didn't know then it's on me. Do you recommend I not use the D's and just buy two more R's and trash the two D's?

Reply

Chris R.

5/15/2020

@NazL I would definitely replace the D (bias play) tires with R (radial) units as soon as you can. It's just going to result in much better tread wear and lifespan on those tires. You could keep the bias tires around to use as spares - they would be fine to use in a pinch when needed.

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Answer 1

An ST205/75R15 tire size like you have now will have a section width of 8.1 inches and overall diameter of 27.3 inches. An ST225/75R15, #AM10256, will have a section width of 8.9 inches and overall diameter of 28.4 inches. So the larger size is 0.8…

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Answer 2

Good question, and what happens is that leaf springs elongate over time, and since you mentioned you got measurements of 25-1/2 inches from center eye to center eye and 26 inches under partial load, the best option for leaf springs really is the…

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Answer 3

For a wheel that is 5 inches in width and 15 inches in diameter you would want tires that are size ST205/75-15. For the tire size ST225/75R15 you listed you would want a rim that is from 6-7 inches in width. I attached a department page that has all…

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Answer 4

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Answer 5

In order to upgrade from a 205/75-15 tire to a larger size, the 225/75-15 which is what we offer you will need to account for the reduced clearance. The new size is 1.2" larger in diameter and .8" larger in width but you only need to…

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Answer 6

The 205/75-15 Tire and Wheel Combo, #AM32395, is 8.1 inches wide and 27.3 inches tall. An F78-14 tire and wheel will be about the same width but it will be 1 inch shorter. I have included a link to a tire size FAQ article that should help.

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Answer 7

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Answer 8

The Kenda Karrier ST205/75R14 Radial Trailer Tire #AM10235 (Load Range D) and the Kenda Karrier ST215/75R14 #AM10229 (Load Range C) that you referenced are simply different tire sizes. The ST215/75R14 tire size is larger in diameter/height by just…

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Answer 9

Good news, I can help you find a tire for your Sundown Horse Trailer. The 205/90-15 is a close tire size to the 7.00-15. The closest size to a 7.00x15 tire that we offer would be a 225/75-15. One 225/75-15 tire that could work for you is the Kenda…

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Answer 10

You can certainly change your trailer tires to a narrower 205mm width as long as your wheels are 6- or 6-1/2-inches in width. These are the only size wheels that can take both 225mm and 205mm tire sizes. Please refer to the linked article on tire…

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Answer 12

The Mighty Cord Replacement Hardwire RV Plug part #A10-P30VP is about 4" long x 2-1/2" wide x 2-1/4" thick. This should fit inside your power cord hatch but you will need to measure to be certain.

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Difference Between Trailer Tire Sizes ST205/75R15 and ST225/75R15

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