Trailer Tire Load Ranges, Speed Ratings and Sizes to Avoid Blowouts

Question

Question:

I have a triaxle toy hauler gvw 18,000lbs. Tire size is ST225/75R15 load range E. Should I go to a larger size to eliminate blowing more tires. These are the tires that came on the vehicle. It doesnt seem to matter what speed I travel, the last one went at 50 mph.

asked by: Gregory M

1

Helpful Expert Reply:

Special trailer tires in any given size are available in various load ranges as you noted, but they also can have different speed ratings too. Driving a tire faster than its rated speed can lead to failure just like overloading it past its weight capacity can. Both conditions lead to excess heat and that is what typically leads to a tire failure.

Since your 18K trailer has 3 axles and 6 tires each tire should be rated for approximately 3000-lbs if you routinely operate the trailer at its maximum GVWR. In your tire size ST225/75R15 the highest weight load range we offer is a LR E tire. All such tires appear on the linked page and all are rated for 2830-lbs.

The Westlake LR E radial # LHWL304 has a speed rating "L", meaning it is good to 75-mph, but the Provider # TR225LRE has a speed rating "M", which means it is rated for up to 81-mph. The same applies to the Kenda # AM10303 and to the Provider # TR225LRE which are also M-rated.

No matter your tire size, load range and speed rating, always keep special trailer tires inflated to the maximum cold psi pressure noted on the sidewall.

expert reply by: Adam R

1

Howard D.

4/20/2020

I have a single axle boat trailer. Boat weighs in about 2400lbs. Tire size is a 205 75 R14. I continually have issues with blow outs and the tread peeling off. I dont normally run over 65 mph, especially when its hot I live in Phoenix, but still have issues. Is there a better tire for this application? I would at least like to run 70 or so so I dont get run over on the interstates..Thoughts..?

Chris R.

4/22/2020

You can stay within that same 205/75R14 tire size while still getting a pretty significant upgrade. I recommend checking out the Goodyear Endurance # 724864519. It as more than enough capacity for your boat trailer, features a maximum speed rating of 87 mph (the highest we have), and is made in the USA. The quality of the Endurance line is closer to what you would see on a standard passenger vehicle. As long as you make sure they're properly inflated, you shouldn't have the same kinds of issues you've been experiencing.

Answer 1

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Answer 2

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Answer 3

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Answer 4

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Answer 5

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Answer 6

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Answer 7

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Answer 8

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Answer 9

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Answer 10

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 11

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Answer 12

The #84 spindle is just a common way to identify the spindle dimensions typically used for 3,500 lb axles. So instead of listing out the parts, people can just say they have #84 spindles and it's easier to know what fits it. The CE Smith Trailer…

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