Ultra str
Trailer King Ultra Str; UTQG, warranty, prices, and OEM vehicle fitments.
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NHTSA-reported issues for trailer king ultra str
Top issue category: Tires (General)
Most reported: Tires (General) (31) · Tread / Belt (28) · Sidewall (2) · Spare Tire (1)
What owners described
Blowout or sudden deflation appears in 45% of these reports; about 2.2× as often as across all tire complaints. Percentages are shares of the 42 reports filed against Trailer King tires across every line and vehicle that include a written account; a single report can describe more than one problem, so they do not total 100%.
| Reported problem | This subject | All tire complaints | Relative |
|---|---|---|---|
| Blowout or sudden deflation | 45% | 20% | 2.2× |
| Tread or belt separation | 36% | 13% | 2.7× |
| Sidewall failure | 10% | 15% | 0.6× |
| Loss of control, rollover or collision | 10% | 8% | 1.1× |
| Bubble or bulge in the tire | 5% | 6% | 0.8× |
| Pressure-monitoring (TPMS) fault | 5% | 2% | 2.0× |
Mileage at failure
11 of these reports state an odometer reading. The middle report is at 2,000 miles, with 8 in 10 falling between 1,500 and 3,000 miles.
In owners' own words
Verbatim excerpts from complaints filed with NHTSA about Trailer King. Reports are published by NHTSA as filed and are lightly cleaned here only to remove intake codes.
TIRES CHECKED FOR PROPER PRESSURE PRIOR TO DRIVING FOR 2 HOURS AT 65 MPH OR LESS, EXPERIENCED BLOWOUT WITH STEEL BELT SHREDDED AND EXPOSED. USED SPARE TIRE OF IDENTICAL MAKE AND DOT DATA. AFTER DRIVING AN ADDITIONAL 8 MILES ON SPARE TO REACH DESTINATION,, IT TOO WAS SHOWING SEPARATION OF THE TREAD AT THE EDGE. TOOK BOTH TIRES PLUS A 3RD IDENTICAL TIRE (SAME DOT DATES)) TO TIRE SHOP FOR REPLACEMENTS AND WAS TOLD THE 3RD TIRE WAS ALSO OUT OF ROUND AND NEEDED TO BE REPLACED. WHEN WE CHECKED TWO REMAINING TIRES ON THE UNIT ANOTHER IS SHOWING OUT OF ROUND. ALL 4 TIRES WERE UNDER TWO YEARS OLD, INSTALLED 16 MONTHS EARLIER AND HAVE LESS THAN 3000 MILES ON THEM.
As part of my routine pre-trip inspection I found both trailer king st225/75r15 tires on the passenger side of the camper had bulged in the tread area giving them a larger diameter than the tires on the driver's side. Tires had TPMS and were always monitored and inspected prior to each trip. Required inflation pressure was 80 psig. No curbs were ever run over. Tires were covered in off season. No other signs of external damage.
WHILE PULLING OUR FIFTH-WHEEL TRAILER, WE HAD A TREAD SEPARATION WITH ONE OF OUR POWER KING TOWMAX STR TIRES. THE RESULTING TIRE FAILURE, CAUSE BODY DAMAGE TO BOTH THE PLASTIC AND ALUMINUM SKIRTING ON THE RV. TRAVELING SPEED: 60 MPH. TIRE PRESSURE: 80 PSI. TREAD DEPTH: 6/32".
TIRE #1 BLEW OUT IN OKLAHOMA ON JUNE 14TH AND WAS LEFT BEHIND. AT THE TIME, I THOUGHT IT WAS A RANDOM FAILURE AND JUST MOVED ON. TIRE #2 BLEW OUT IN TENNESSEE ON JUNE 28TH. THE TIRE TECHNICIAN AT DISCOUNT SHOWED ME HOW TIRE #3 WAS SEPARATED AND READY TO FAIL. THE SPARE NEXT TO IT WAS FLAT ACROSS THE TREAD, BUT #3 WAS NOTICEABLY DOMED. AFTER IT WAS REPLACED HE PUSHED DOWN ON THE TREAD AND YOU COULD HEAR THE SOUND OF THE METAL PLIES IN THE TIRE MOVING AROUND. TBC BRANDS PASSED MY CLAIM ONTO UNICORN TIRE CORPORATION. THEY HAD THE TIRE INSPECTED AND AGREED IT SHOWED STEEL BELT SEPARATION. THEY OFFERED $375 FOR $2000 DAMAGE. IT IS SAD THESE TIRES ARE USED ON NEW KEYSTONE TRAILERS. TRAILER MODEL IS COUGAR, NOT AVAILABLE IN WEBSITE PULLDOWN BOX.
Complaints are voluntarily submitted to the NHTSA Office of Defects Investigation and are not verified by NHTSA; they represent owner-reported problems, not proven defects. Counts can be useful as a relative quality signal across comparable tires or vehicles.
Specs
| Brand | Trailer King |
|---|---|
| Model | Ultra Str |
| Season | N/A |
| Type | N/A |
| UTQG treadwear | N/A |
| UTQG traction | N/A |
| UTQG temperature | N/A |
| Mileage warranty | N/A |
| Noise (dB) | N/A |
| Introduced | N/A |
Live prices
Live prices for this tire are being verified. Use the shop links below to compare across our online retailer partners.
Available sizes (0)
Size data being verified.
Trailer king ultra str: what the numbers tell you
Manufacturer treadwear data for the Ultra Str is not publicly listed. This is common for OEM-only or track-day tires that don't carry a US treadwear warranty. No mileage warranty is published for this tire, which is typical for performance summer and track-day rubber where the manufacturer doesn't make wear-life claims.
Cabin noise data for this tire is not published by the manufacturer. As a general tire built for the passenger segment, the Ultra Str is positioned against direct rivals within the same category. Comparing it to a tire in a different category (e.g. summer vs all-season) makes the spec sheet misleading because the design targets are not the same.
The Trailer King Ultra Str has been part of Trailer King's catalog since its introduction, and remains a current-production model.
For an apples-to-apples comparison against direct rivals, see the comparison pages linked from this tire's brand index.
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Last verified 2026-10-07.