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

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!!

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).

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?

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.

See All (9) Replies to Naz L. ∨

Tom

3/20/2024

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

Jameson C.

3/28/2024

@Tom Yep.

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?

Jameson C.

4/22/2024

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

Edwin

4/30/2024

The 2830 is that the additional weight with 4 tires? I have a 7000 lbs car trailer that I carry 4400 lbs tractor on. It carry it well but thinking I need to upgrade. Thank you

Jameson C.

5/1/2024

@Edwin That weight is per tire so you'd multiply that by 4 to get the overall tire weight capacity which would be 11,320 lb.

Answer 1

Thanks for reaching out, Nick! I'm not 100% sure what your bolt pattern is so I'll include a few different options. Some of the numbers you gave are OEM number so based off that I THINK your bolt pattern is a 5 on 4-1/2. You will want to…

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Answer 2

Hi Bruce! The Kenda Karrier KR53 ST205/75R15 Radial Trailer Tire with 15" Silver Mod Wheel - 5 on 4-3/4 #KE42EV isn't balanced the way vehicle tires are, but they are "balanced" in a manner of speaking. What trailer tire…

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Answer 3

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 4

Hi Michael! The 5 on 4-3/4 bolt pattern is getting to be pretty uncommon, but we do have the Kenda Karrier KR53 ST205/75R15 Radial Trailer Tire with 15" Silver Mod Wheel - 5 on 4-3/4 #KE42EV that would be a good option. We don't have any…

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Answer 5

Hey Ben, that's a pretty rare wheel bolt pattern but we can actually help. The Kenda Karrier part #KE42EV is an ST205/75R15 mounted on a silver wheel with a 5 on 4-3/4 inch bolt pattern like you are wanting. The R in the tire size indicates that…

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Answer 6

If you plan on going to a bigger tire as you mentioned you can take a quick measurement to make sure you have the room. To go from a 205 tire to a 225 will increase the height about 1.2 inches overall. If you have fenders it will be a little over 1/2…

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Answer 7

What's up, Chuck? You can definitely use higher-rated springs for your trailer, and for that I recommend checking out the 25-1/4" Long 4-Leaf Double-Eye Spring for 4,400-lb Trailer Axles #DX95CR. Be sure to change out the leaf springs on…

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Answer 8

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 9

Hello Jason. Generally, we do want the shackle size to be an exact match, but a difference of 3/8" should not be an issue. There is a bit of tolerance when replacing shackles but anything less than 1/2" is considered acceptable. The MORryde…

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Answer 10

The shackle strap length is measured from the center of one bolt hole to the center of the other. The Dexter Heavy Duty Suspension Upgrade Kit for Single Axle Trailers - Double Eye Springs #K71-358-00 uses 3-1/8" long shackles which are found on…

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Answer 11

Thank you for the extra clarification! You need to have the same size tires all around your trailer, otherwise you're going to run into all of the problems that you mentioned. It might not be immediate, but it's going to cause uneven wear and…

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Answer 12

Hey Michael. The Kenda Karrier KR53 ST205/75R15 Radial Trailer Tire with 15" Silver Mod Wheel - 5 on 4-3/4 item #KE42EV has a speed rating of N. This means it can go up to 87 mph. What kind of trailer do you have?

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

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