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Nitto NT421Q 255/55R-18

  • Part Number: 210690
  • Service Description: 109 V
  • UTQG: 640AA
  • Sidewall: BW
  • Load Range: XL
  • Treadlife Warranty: 75000 miles
  • Type: Passenger All Season
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SALE: 15% OFF Entire Order of Select Nitto Tires. Use Code NITTO15

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$664.00 Set of 4

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for $16.60 a tire


Nitto NT421Q 255/55R-18

Nitto™s NT421Q all-season tires are built for performance on SUVs and crossovers. Their stylish and unique tread pattern ensures quiet, comfortable rides as well as reliable performance on wet and dry surfaces. These tires feature intelligent maintenance indicators that show how the tires are wearing. Nitto™s advanced 3D multiwave siping where sipes interlock to act as whole tread blocks when braking enhances the safety and braking precision of these tires.

Features & Benefits

  • Added shoulder inserts protect tires from adverse conditions and potholes
  • Large exterior tread blocks add stability
  • Deep and wide grooves expel water to prevent aquaplaning

Tire Specifications

NT421Q 255/55R-18

Size UTQG Max. Load Inflation Pressure Tread Depth Rim Width Range Sect. Width Tread Width Overall Diam
255/55R-18 640AA 2,271 lbs 50 psi 12/32nds 7.0-(8.0)-9.0" 11" N/A 29"

Purchase includes the Nitto NT421Q tire only. The wheel rim shown in the picture is not included. Picture provided is a stock picture from the manufacturer and may or may not reflect the actual product being ordered.

All Nitto NT421Q tires are continuously developing with manufactured improvements. With that said, Simple Tire and the manufacturers have the right to change these tire specifications at any time without notice or obligation.

If you have any questions, please email us at

Please Note: Specifications of the Nitto NT421Q tires shown above are listed to be as accurate as possible based on the information provided to us by Nitto tires.

Available Sizes & Prices

NT421Q 255/55R-18

Size Serv. Desc. UTQG Sidewall Part Number Price Qty
225/55R19 103V 640AA BW 210950 $740 set of 4 $185.00 View Details
225/55R18 102V 640AA BW 210670 $560 set of 4 $140.00 View Details
225/60R17 103V 640AA BW 210610 $480 set of 4 $120.00 View Details
225/65R17 106H 640AA BW 210640 $508 set of 4 $127.00 View Details
235/50R19 103V 640AA BW 210760 $760 set of 4 $190.00 View Details
235/55R20 105W 560AA BW 210890 $796 set of 4 $199.00 View Details
235/55R19 105W 560AA BW 210790 $748 set of 4 $187.00 View Details
235/55R18 104V 640AA BW 210680 $604 set of 4 $151.00 View Details
235/60R17 106H 640AA BW 210620 $516 set of 4 $129.00 View Details
235/60R18 107W 560AA BW 210700 $568 set of 4 $142.00 View Details
235/65R17 108H 640AA BW 210650 $520 set of 4 $130.00 View Details
235/65R18 110H 640AA BW 210730 $584 set of 4 $146.00 View Details
245/50R20 105V 640AA BW 210860 $704 set of 4 $176.00 View Details
245/55R19 107H 640AA BW 210800 $692 set of 4 $173.00 View Details
245/60R18 109H 640AA BW 210710 $592 set of 4 $148.00 View Details
245/65R17 111H 640AA BW 210660 View Details
255/45R20 105W 560AA BW 210840 $708 set of 4 $177.00 View Details
255/50R19 107V 640AA BW 210770 $732 set of 4 $183.00 View Details
255/50R20 109V 640AA BW 210870 $748 set of 4 $187.00 View Details
255/55R19 111V 640AA BW 210810 $792 set of 4 $198.00 View Details
255/55R20 110H 640AA BW 210900 $732 set of 4 $183.00 View Details
255/60R19 113H 640AA BW 210820 $748 set of 4 $187.00 View Details
255/60R17 110V 640AA BW 210630 $576 set of 4 $144.00 View Details
255/65R18 115H 640AA BW 210740 $676 set of 4 $169.00 View Details
265/50R19 110V 640AA BW 210780 $888 set of 4 $222.00 View Details
265/50R20 111V 640AA BW 210880 $704 set of 4 $176.00 View Details
265/60R18 114V 640AA BW 210720 $612 set of 4 $153.00 View Details
265/65R18 114H 640AA BW 210750 $636 set of 4 $159.00 View Details
275/40R20 106W 560AA BW 210830 $792 set of 4 $198.00 View Details
275/45R20 110W 560AA BW 210850 $696 set of 4 $174.00 View Details
275/50R20 113H 640AA BW 210590 $920 set of 4 $230.00 View Details
275/55R20 117V 640AA BW 210910 $724 set of 4 $181.00 View Details
275/55R17 109V 640AA BW 210600 $704 set of 4 $176.00 View Details
275/60R20 115H 640AA BW 210920 $756 set of 4 $189.00 View Details
285/45R22 114V 640AA BW 210930 $880 set of 4 $220.00 View Details

Treadlife Warranty

NT421Q 255/55R-18

This product is covered by a 75,000 mile manufacturer’s treadlife warranty.

Merchandise covered by a manufacturer’s warranty is sold with the warranty by the manufacturer extended to the purchaser. We will be happy to assist in obtaining fulfillment of a manufacturer’s warranty. Other than applicable manufacturers’ warranties, there are no warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose.

The only tires SimpleTire can warranty are brand new defects (meaning that they have not been mounted or driven on). Any bead damaged will be void of any warranty claim. Any other adjustments should be taken to the nearest authorized dealer for that manufacturer.

Sometimes the manufacturer also provides a treadlife warranty and mileage rating. Please be aware that not all tires hold a mileage warranty from the manufacturer. Different tire models, even from the same manufacturer, may or may not come with a treadlife warranty.

Customer Support

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Ratings & Reviews

Nitto NT421Q

David Chaffey
I have a 2006 Volvo XC90 front wheel drive. The Nitto NT421Q transformed the car, its ride and handling. So much smoother, quieter than previous tires. Handling is smooth and precise. Way too early to tell about tread-life, but so far, loving them.
William Hart
Put these on a 2011 Acura MDX replacing the original Bridgestones Rides and handles like a different vehicle. Sharper turning and better handling. Went from truck-like to sporty. By submitting a review, each person received a sweepstakes entry.
Robert Alexander
Great tire for a great price at Simple Tire. I have these tires on a 1500 Sierra Truck and the ride and noise are excellent.

Nitto NT421Q 255/55R-18


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