Nitto NT421Q Tire Review

Nitto NT421Q Tire Review

Feb 1st 2021

The NT421Q from Nitto is an ultra-high performance tire. This model attempts to ensure a combination of a smooth and comfortable driving experience with outstanding handling and an overall high performance drive. The NT421Q was manufactured with an all season tire compound containing silica and a special high-grip polymer, as well as a wear-oriented polymer to provide superior surface grip. These construction elements guarantee enhanced handling as well as overall stability and most importantly, safety when driving at high speeds.

Quick Review

  • Season: All Season
  • Type: Performance
  • Car Type: Passenger vehicles and SUVs
  • Run Flat: NO
  • In Stock: Yes (Check Price)

Are Nitto NT421Q tires good?

Nitto tires are a mid-range tire brand. They ensure great traction, comfort and lower road noise, they are also very stylish. Most buyers agree that the Nitto NT421Q are good value for money.

Experience the Nitto NT421Q

When it comes to dry terrain traction and gripping ability during cornering, the NT421Q has a secret weapon. The model features rubber inserts in the shoulders that strengthen its sidewalls and enable them to withstand high speed pressure in cornering situations. Usually, this addition to a tire will negatively impact the driving comfort levels on tires that have as strong sidewalls as the NT421Q does, but that is not the case with this model. This is due to its strong sidewalls that are able to keep their flexibility during high pressure driving. This all season tire also excels in winter weather unlike any other all season model, as Nitto utilizes a specific siping method usually reserved for specialty winter models. This enables the tire to confidently perform even in harsh winter conditions. This tire is designed for on-road application and is not intended to be used in off-road driving. However, considering its winter performance ability it will probably put in a solid performance in loose dirt and other slight off-road situations.

The NT4210Q also handles wet terrains without any issues, as it features a hydroplaning-resistant design. The tire’s grooves are made to be deeper and wider to evacuate water and slush from the tire’s footprint with extra efficiency, thereby completely eliminating the danger of hydroplaning during high speed performance. The Nitto NT4210Q boasts enhanced durability as well. This feature also enables a comfortable drive and reduces road noise. The model is constructed with two steel belts and a nylon reinforcement as well as a polyester cord body. These elements ensure superior ride comfort. Nitto has utilized the Quiet Serration Technology and a variable pitch tread block sequence to ensure a comfortable driving experience and prevent road noise. This tire is one of the quietest tires in its class as it is designed to cancel out the road noise and prevent it from penetrating the tread elements, guaranteeing a quiet and peaceful drive.

The Nitto NT421Q also features Intelligent Maintenance Indicators. These indicators serve to show the level of tread wear on the tire. This enables the driver to react quickly if there is irregular wear that signals problems with the tire or its alignment. They are located on the walls of the circumferential grooves and they provide a visual monitor of the tread wear rate and alert the driver of wear issues. The driver can easily notice when the tire is wearing irregularly, simply by checking the Maintenance Indicators. If the indicators are wearing unevenly, this signifies a problem with the camber or suspension alignment. This is a nice and easy way to check the condition of the tires and your vehicle in general. The model also features Nitto’s exclusive 3D multi-wave and 3D interlocking sipe design. This feature allows the numerous sipes to lock together as you apply the brakes or accelerate from a full stop. The sipes lock together and this creates a larger contact patch that enhances the traction. This also ensures improved handling and powerful cornering in all weather conditions.

Although performance-wise it might not be the most important factor but it's worth mentioning, that the Nitto NT421Q is a good-looking tire. It boasts a gorgeous and sporty asymmetric tread design with the face of the tire being divided into two sections. The outer shoulder contains larger tread blocks while the inner is equipped with smaller blocks with larger open grooves.


  • Hydroplaning resistance
  • Enhanced comfort and reduced road noise
  • Superior all weather traction
  • Intelligent Maintenance Indicators


  • Higher price


Nitto offers a 60,000 mile treadwear warranty with the W speed rated sizes and a 75,000 mile treadwear warranty with the H and V speed rated sizes of this model. The asymmetric tread pattern features a 3D multi-wave interlocking siping detail that ensures excellent dry, wet and winter weather road gripping ability. The tire also performs especially well in winter weather thanks to the large, open grooves of the inner shoulder and the high density siping design that promotes additional biting edges. The three wide circumferential grooves avoid hydroplaning in dangerous situations by channeling water and slush away from the tire footprint. The tread design evenly spreads the driving pressure out across the entire tread area to prevent irregular wear patterns from forming. Uneven tread wear is also combated by the tire’s Maintenance Indicators. These are located on the walls of the circumferential grooves and they provide a visual monitor of the tread wear rate and alert the driver of wear issues. The tire is quick and precise in its steering response and is stabilized during the drive to allow it to be easier to navigate. The tread’s outer shoulder design promotes an increased number of biting edges that firmly grip the road during cornering situations. They maintain road contact and boost the cornering and maneuvering ability and power. This ensures excellent controllability all throughout the year.


The NT421Q is truly a gem in Nitto’s collection. This is one of the best all season models on the market. It measures up across the board to all the top models in its class. The tire also looks good and ensures reduced noise and comfortable driving even when the vehicle is revved up at higher speeds. You can’t go wrong with this model if you’re in the market for a top-shelf all season model with high performance capability. This excellent quality comes at a price. You will need to relieve your wallet of $550 - $700 for a set of these great tires. But you will definitely get a good bang for your buck.

  • Hydroplaning resistance
  • Enhanced controllability
  • Improved cornering ability
  • Maintenance Indicators

Check available sizes for Nitto NT421Q.

Frequently Asked Questions (FAQs)

Who makes Nitto NT421Q tires?

The Nitto tire brand is owned by Toyo Tire Holdings of Americas Inc.

Are Nitto tires made in China?

Nitto Tire is now produced in at least six plants around the world, in the United States, Japan, China, and Malaysia, and sells off-road, performance, and luxury tires nearly everywhere.

Are Nitto and Toyo the same company?

Nitto and Toyo are part of the same parent company, and most of their tires use the same carcass for the tires with different sidewall and tread.