Falken 615 Vs. 660: The Battle Of The Performance Tires

Tires can make or break your driving experience, and Falken is a brand that’s been making waves in the world of performance tires.

In this article, we’ll be comparing the Falken Azenis RT615K+ and the Falken Azenis RT660, two of their most popular performance tires. We’ll cover their pros and cons, answer some frequently asked questions, and help you determine which tire is best for your needs.

A Brief Comparison Table

FeatureFalken Azenis RT615K+Falken Azenis RT660
VersatilityHigh (Autocross, Track, Street)Moderate (Best for Track/Autocross)
LongevityBetter lifespanShorter lifespan
AffordabilityMore affordableHigher price
GripGood gripExceptional grip
Warm-up TimeSlower warm-upQuicker warm-up
HandlingGood handlingSuperior handling
Tire WidthTrue to size or slightly narrowTrue to size or slightly wide
Optimal TemperatureSimilar to RT660Similar to RT615K+

A Tale of Two Tires: The Falken 615 and 660 Story

Once upon a time, there were two tires, the Falken Azenis RT615K+ and the Falken Azenis RT660. Both were designed for high-performance driving, but each had its unique characteristics.

The 615 was known for its versatile performance and longevity, while the 660 was the new kid on the block, boasting exceptional grip and handling. Drivers everywhere wanted to know: which tire was the better choice?

Falken Azenis RT615K+: The Versatile Performer

Falken 615 Tire

The Falken Azenis RT615K+ is a tire that has been around for quite some time, earning a reputation for its well-rounded performance. Its pros include:


  • Versatility: The 615K+ is designed for a variety of applications, including autocross, track days, and spirited street driving. It performs well in both wet and dry conditions.
  • Longevity: The 615K+ is known for its durability, which means you won’t have to replace your tires as often as with some other performance tires.
  • Affordability: The 615K+ typically costs less than the 660, making it a more budget-friendly option for those who want performance without breaking the bank.


  • Less grip: While the 615K+ has good grip, it doesn’t quite match the sheer grip offered by the 660.
  • Slower warm-up: The 615K+ may take longer to reach optimal performance temperatures, which can be a downside for some drivers.

Also Read: Differences Between Hercules H/P 4000 And Cooper Cobra Tires.

Falken Azenis RT660: The Ultimate Grip Machine

The Falken Azenis RT660 is the new kid on the block, designed specifically for maximum grip and handling. Its pros include:


Falken Azenis RT660 Tire
  • Exceptional grip: The 660 boasts incredible grip, making it ideal for autocross and track days where every bit of traction counts.
  • Quick warm-up: The 660’s compound and design allow it to warm up faster, reaching optimal performance temperatures more quickly than the 615K+.
  • Improved handling: The 660’s tread pattern and construction contribute to its superior handling, providing drivers with more precise control and feedback.


  • Shorter lifespan: The trade-off for the 660’s grip and performance is a shorter lifespan compared to the 615K+.
  • Higher price: The 660 typically costs more than the 615K+, so it might not be the best option for drivers on a tight budget.

Also Read: Differences Between Costco Tires And Discount Tire.

FAQs: Answering Your Burning Questions

Is Falken RT660 semi-slick?

Yes, the Falken Azenis RT660 is considered a semi-slick or “R-compound” tire. It’s designed for maximum grip and performance, with a tread pattern and compound that provide exceptional traction in both wet and dry conditions.

How long does RT660 last?

The lifespan of the Falken Azenis RT660 varies depending on factors like driving style, vehicle type, and road conditions. However, it’s generally considered to have a shorter lifespan than the Falken Azenis RT615K+ due to its focus on performance and grip. Drivers who frequently participate in track days or autocross events should expect to replace the RT660 more often than the RT615K+.

Do Falken RT660 run wide?

Falken Azenis RT660 tires tend to run true to size or slightly wider than some other performance tires. This characteristic contributes to the tire’s excellent grip and handling. When selecting the right size for your vehicle, it’s important to consult the manufacturer’s recommendations and consider factors like wheel size and clearance.

What is the best tire pressure for a Falken RT660?

The ideal tire pressure for the Falken Azenis RT660 depends on your specific vehicle, driving conditions, and personal preferences. As a starting point, you can use the manufacturer’s recommended tire pressure, which is typically listed in your vehicle’s owner’s manual or on a sticker located inside the driver’s side doorjamb. For track days or autocross events, you may need to adjust the tire pressure to optimize performance. It’s essential to monitor and adjust tire pressure regularly to ensure safety and maintain optimal performance.

What temperature should RT660 be?

The Falken Azenis RT660 performs best at temperatures between 160°F and 220°F (71°C and 104°C). This temperature range allows the tire compound to provide maximum grip and handling. It’s essential to warm up your tires before pushing your vehicle to its limits, especially during track days or autocross events. Tire warmers can be used to help bring the tires up to temperature, or you can gradually increase your driving speed during the initial laps to warm them up.

The Verdict: Which Tire Should You Choose?

Both the Falken Azenis RT615K+ and the Falken Azenis RT660 offer outstanding performance, but each has its pros and cons.

If you’re looking for a versatile tire that performs well in various conditions and offers a longer lifespan, the 615K+ might be the better choice. However, if maximum grip, handling, and performance are your top priorities, the 660 is hard to beat.

Ultimately, the right tire for you depends on your specific needs, preferences, and budget. By carefully considering the pros and cons of each tire, you can make an informed decision that will help you get the most out of your driving experience.

Clayton S. Johnson

Well, I am Clayton who writes, manages, and does overall stuff for this website. I live somewhere in Stone Mountain, Georgia, and used to have a full-time job. But the pandemic taught me to do more do with my life. So, I quit my job and travel a lot! Since I have tons of time now, I write about all the stuff I have done, used, and have first-hand experiences.

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