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

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.

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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 Contender # C22515E which are also M-rated.

If you have room to move up to a larger diameter and wider wheel/tire size like 235/80-16 then you can choose tires with a LR G weight capacity of as much as 4080-lbs, such as the Provider ST235/80R16 Radial Trailer Tire with 8-on-6-1/2 Wheel # A16R80GSM. This has both a weight capacity of 4080-lbs and an "M" speed rating too.

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.

helpful expert reply by:
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Adam R

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