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NHTSA-reported issues for nitto nt421q
Top issue category: Tires (General)
Most reported: Tires (General) (41) · Tread / Belt (19) · Sidewall (8) · Bead (2) · Spare Tire (1)
What owners described
Blowout or sudden deflation appears in 34% of these reports; about 1.7× as often as across all tire complaints. Percentages are shares of the 58 reports filed against Nitto 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 | 34% | 20% | 1.7× |
| Tread or belt separation | 19% | 13% | 1.4× |
| Sidewall failure | 12% | 15% | 0.8× |
| Loss of control, rollover or collision | 12% | 8% | 1.4× |
| Cracking or dry rot | 10% | 9% | 1.1× |
| Bubble or bulge in the tire | 3% | 6% | 0.6× |
Mileage at failure
41 of these reports state an odometer reading. The middle report is at 25,000 miles, with 8 in 10 falling between 8,000 and 108,539 miles.
In owners' own words
Verbatim excerpts from complaints filed with NHTSA about Nitto. Reports are published by NHTSA as filed and are lightly cleaned here only to remove intake codes.
THE CONTACT OWNS A 2001 DODGE RAM 1500 EQUIPPED WITH NITTO MUDGRAPPLER TIRES (NA), SIZE 33X12.50R17 LT. THE DOT NUMBER WAS 73BDED54311. THE CONTACT STATED THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC FOR AN UNRELATED REPAIR AND THEY NOTICED THAT THE TREAD ON ALL FOUR TIRES WAS DRY ROTTED. THE TIRES HAD NOT BEEN REPLACED. THE MANUFACTURER WAS NOTIFIED OF THE PROBLEM. THE APPROXIMATE FAILURE MILEAGE WAS 173,739.
TIRE BLOWOUT WITH COMPLETE TREAD SEPARATION WHILE TRAVELING ON INTERSTATE PULLING A HORSE TRAILER. WAS ABLE TO SAFELY PULL TO SHOULDER & CHANGE TIRE FOR SPARE. TREAD DAMAGED TRUCK PANEL, TAILPIPE & BENT FRONT AXLE OF TRAILER. TIRES WERE WELL MAINTAINED AND HAD BEEN CHECKED BEFORE DEPARTURE. TIRES WERE NITTO TERRA GRAPPLER LT 285/75R16 126/123Q LOAD RANGE E.
THE CONTACT OWNS A 2007 CHEVROLET CORVETTE. THE VEHICLE WAS EQUIPPED WITH NITROUS SEC FOOSE 8 1/2 BY 19 AND REAR 10 1/2 BY 19(NA) TIRES. THE CONTACT STATED THAT THE TIRES FAILED AND THE SIDEWALLS SPLIT BEFORE THE CONTACT COULD PLACE 100 MILES ON THE TIRES. THE TIRES HAD NOT BEEN REPLACED. THE DOT NUMBER WAS UNKNOWN. THE TIRE FAILURE MILEAGE WAS 100. THE VIN AND VEHICLE FAILURE MILEAGE WERE UNKNOWN.
THE CONTACT OWNS A 2002 FORD F-150 EQUIPPED WITH FOUR TOYO NITTO TERRA GRAPPER TIRES, SIZE: 285/55/20 (NA). WHILE DRIVING 60-65 MPH, THE VEHICLE SHOOK VIOLENTLY. THE CONTACT EXITED THE VEHICLE AND NOTICED BUBBLES IN THE TREAD ON BOTH FRONT TIRES. THE LOCAL DEALER WAS NOT CONTACTED. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS CONTACTED AND DID NOT ASSIST. THE VIN AND DOT NUMBER WERE UNKNOWN. THE APPROXIMATE VEHICLE FAILURE MILEAGE WAS 40,000 AND THE TIRE FAILURE MILEAGE WAS 25,000.
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 | Nitto |
|---|---|
| Model | Nt421q |
| Season | all-season |
| Type | truck-suv |
| UTQG treadwear | 640 |
| UTQG traction | A |
| UTQG temperature | 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 (40)
- 285/75R16
- 225/60R17
- 225/65R17
- 245/65R17
- 255/60R17
- 265/70R17
- 285/70R17
- 235/55R18
- 235/65R18
- 265/65R18
- 275/70R18
- 235/55R20
- 255/45R20
- 275/60R20
- 225/55R18
- 225/55R19
- 235/50R19
- 235/55R19
- 235/60R17
- 235/60R18
- 235/65R17
- 245/50R20
- 245/55R19
- 245/60R18
- 255/50R19
- 255/50R20
- 255/55R18
- 255/55R19
- 255/55R20
- 255/60R19
- 255/65R18
- 265/50R19
- 265/50R20
- 265/60R18
- 275/40R20
- 275/45R20
- 275/50R20
- 275/55R17
- 275/55R20
- 285/45R22
Nitto nt421q: what the numbers tell you
The Nt421q's UTQG treadwear rating of 640 puts it in the long-wear class. Its compound is engineered for life over outright grip, which is appropriate for an everyday touring tire. 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 all-season tire built for the truck-suv segment, the Nt421q 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.
Introducing the Nitto NT421Q, a premium all-season tire designed to provide exceptional performance, versatility, and comfort for your SUV or crossover. Engineered with advanced technology and a focus on delivering an exceptional driving experience, the Nitto NT421Q is the perfect choice for discerning drivers who demand the best. The Nitto NT421Q features an innovative tread pattern and an advanced silica compound that deliver excellent traction on both wet and dry surfaces. Its optimized design provides reliable grip, allowing for confident acceleration, precise handling, and responsive braking. This tire is engineered to provide exceptional performance in various weather conditions, making it a reliable choice throughout the year. Comfort and quietness are prioritized in the Nitto NT421Q. The tire's construction and sidewall design are engineered to minimize road noise and vibrations, resulting in a smooth and comfortable ride. Whether you're navigating city streets or embarking on a long highway journey, this tire delivers a quiet and enjoyable driving experience. The Nitto NT421Q is designed with versatility in mind. Its all-season capabilities ensure reliable performance in different weather conditions. The tire's optimized tread design and compound effectively channel water away from the tire, reducing the risk of hydroplaning and enhancing wet traction. This tire is engineered to handle diverse road conditions with ease, providing confidence and control in various driving scenarios. Durability is a key feature of the Nitto NT421Q. Its strong construction and reinforced sidewalls offer excellent resistance to cuts, punctures, and impacts, ensuring long-lasting performance and reliability. This tire is built to withstand the challenges of everyday driving and provide peace of mind for miles to come. The Nitto NT421Q also has a sleek and stylish appearance. Its clean sidewall design and modern tread pattern add a touch of sophistication to your vehicle, enhancing its overall aesthetics. Whether you're a daily commuter, a road trip enthusiast, or a driver seeking a tire that delivers a balance of performance, versatility, and comfort, the Nitto NT421Q is the perfect choice. Experience the combination of reliable traction, comfort, and durability that this tire offers. With the Nitto NT421Q, you can confidently navigate different road conditions and enjoy a smooth and controlled ride throughout the year.
For an apples-to-apples comparison against direct rivals, see the comparison pages linked from this tire's brand index.
OEM fitment
Vehicles that ship with this tire
2008
Hummer H3
285/75R16
2010
Hummer H3
285/75R16
2009
Hummer H3T
285/75R16
2007
Hummer H3
285/75R16
2010
Hummer H3T
285/75R16
2006
Hummer H3
285/75R16
2009
Hummer H3
285/75R16
2021
Subaru forester
225/60R17
2016
Toyota alphard
225/60R17
2017
Toyota alphard
225/60R17
2015
Toyota alphard
225/60R17
2022
Toyota alphard
225/60R17
Recommended for this vehicle
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Last verified 2026-10-07.