Falken Azenis RT660 Review: The Street-Legal Track Tire That Transformed My Weekend Drives

I’ll never forget the first corner I took on the Falken Azenis RT660.

The grip was so immediate, so confidence-inspiring, that I actually laughed out loud in my car. After years of testing various performance tires, I thought I knew what to expect from a 200-treadwear summer tire.

I was wrong. If you’ve been following my Falken tires review coverage, you know I’ve had positive experiences with the brand. But the RT660 operates on an entirely different level.

What Exactly Is the Falken Azenis RT660?

Before diving into my testing experience, let me clarify what this tire is designed for. The Azenis RT660 sits in Falken’s extreme performance summer tire category, positioned as a street-legal tire that can hold its own during track days, autocross events, and spirited canyon driving.

This isn’t a tire for your daily commute to work — though technically, you could use it that way. It’s built for drivers who demand maximum grip and are willing to sacrifice tread life to get it.

Falken developed the RT660 using their motorsports experience, particularly from their drift and time attack programs. The compound and construction borrow heavily from their racing development, which becomes immediately apparent once you push the tire.

My Testing Setup and Methodology

I tested the Falken Azenis RT660 in size 255/40ZR17 on my 2019 Ford Mustang GT. This car provides an excellent platform for evaluating high-performance tires because it has enough power to stress the rear tires while offering a relatively neutral chassis balance.

My testing included several track sessions at a local road course, multiple autocross events, and extensive street driving on both highways and twisty back roads. I also deliberately tested in various weather conditions, including early morning dew and light rain.

I’m not just a journalist who drives press cars for a day. I bought these tires with my own money and lived with them over an extended period, which gives me a much more complete picture than a quick manufacturer demo ever could.

First Impressions: Installation and Break-In

When I first picked up the RT660s from my local tire shop, I was immediately struck by how soft the compound felt. Running my hand across the tread, I could tell this wasn’t going to be a long-lasting tire — the rubber had that slightly tacky feel that screams performance.

The mounting process was straightforward, and my installer didn’t report any issues with bead seating. I appreciated that the tires balanced easily without requiring excessive wheel weights.

During the first few days of driving, I kept the speeds moderate to allow the tires to scrub in properly. Falken recommends a gentle break-in period, and I’ve learned from experience that skipping this step can affect the tire’s ultimate performance.

Even during this initial break-in, I noticed the steering felt sharper than with my previous tires. The RT660’s stiff sidewall construction transmitted road feel with impressive clarity.

Dry Performance: Where the RT660 Truly Shines

Let’s talk about what you really want to know — how does this tire perform when you’re pushing hard?

In a word: spectacularly.

Lateral Grip and Cornering

The lateral grip available from the RT660 is genuinely shocking if you’re coming from a typical performance summer tire. During my first track session, I found myself carrying significantly more speed through corners than I expected, and the tire just kept finding more traction.

The breakaway characteristics are progressive and predictable. When you do exceed the grip limit, the RT660 doesn’t suddenly let go. Instead, it transitions into a gentle slide that’s easy to catch and correct.

For autocross specifically, the RT660 excels at quick transitions and slalom sections. The tire responds immediately to steering inputs without the slight delay you sometimes feel with softer-sidewall tires.

Braking Performance

Stopping power matches the cornering grip. During repeated hard braking zones at the track, the RT660 maintained consistent bite without fading significantly.

I measured my braking distances informally using reference points on the track, and the improvement over my previous tires was substantial. Where I previously needed to brake at a specific marker, I could now go several car lengths deeper before applying the same pressure.

The ABS intervention during emergency stops felt smooth and controlled. The tire allows the electronic systems to work efficiently without the pulsing and grabbing that some ultra-high-performance tires exhibit.

Acceleration Traction

Putting down the Mustang’s power has always been a challenge with lesser tires. The RT660 transformed this experience entirely.

From a standstill, I could apply significantly more throttle before experiencing wheelspin. And when the tires did break loose under hard acceleration, they hooked up again quickly and predictably.

This improved traction confidence allowed me to get on the power earlier exiting corners, which dramatically improved my lap times during track sessions.

Wet Performance: Better Than Expected, But Know the Limits

Here’s where I need to be completely honest with you. The RT660 is not a wet-weather champion, and Falken doesn’t market it as one. However, it performs better in rain than I anticipated.

During moderate rain, the RT660 maintained reasonable grip for a tire in this category. The circumferential grooves do their job of channeling water away from the contact patch, and I never experienced hydroplaning at highway speeds.

That said, the confidence I felt in dry conditions evaporated significantly when the roads got wet. I found myself driving at about 70% of my dry-weather pace, which felt appropriate given the reduced grip available.

My advice? If you live somewhere with frequent rain, the RT660 can handle occasional wet weather, but it shouldn’t be your primary consideration. This tire is built for grip on dry pavement, and that’s where it excels.

Cold Weather Warning

I need to emphasize this point clearly: the RT660 is a summer tire and should not be driven in temperatures below 40°F. The compound hardens significantly in cold conditions, dramatically reducing grip.

During one early morning drive in late fall, I experienced how different the tire felt when temperatures dropped into the upper 30s. The normally sticky compound felt like plastic, and I backed off immediately. If you’re in a region with cold winters, plan to swap to a dedicated winter or all-season tire.

Track Day Performance: My Real-World Sessions

The true test of any extreme performance tire happens at the track, and this is where I spent the most time evaluating the RT660.

Heat Management

One area where the RT660 genuinely impressed me was its heat management. During extended track sessions, many extreme performance tires become greasy and lose grip as they overheat.

The RT660 maintained consistent grip throughout 20-minute sessions even on hot summer days. I monitored tire temperatures using an infrared thermometer, and while the tires definitely got hot, they didn’t exhibit the dramatic performance dropoff I’ve experienced with some competitors.

Between sessions, the tires recovered well. After a 30-minute cool-down period, they felt fresh and ready for another hard session.

Heat Cycle Durability

This is a crucial point for track day enthusiasts. Some extreme performance tires are essentially “one and done” — they deliver incredible grip for their first heat cycle but never quite recover that same level of performance.

In my experience, the RT660 held up better than expected through multiple heat cycles. While I did notice a slight reduction in peak grip after several track sessions, the degradation was gradual rather than sudden.

This makes the RT660 a more cost-effective choice for regular track attendees who don’t want to buy new tires after every event.

Lap Time Improvements

Without revealing specific times that could identify the particular track, I can tell you that the RT660 knocked significant time off my previous personal bests. The combination of improved corner speed, better braking, and earlier acceleration more than compensated for any straight-line speed differences.

More importantly, the tire’s consistency allowed me to drive with confidence lap after lap. I wasn’t worried about sudden grip changes or unpredictable behavior.

Street Driving Experience: Daily Usability Assessment

While the RT660 is clearly designed for performance driving, many enthusiasts will use these tires for street driving between track events. I spent considerable time evaluating how the tire behaves in everyday situations.

Ride Quality

Let’s be realistic — this is not a comfortable tire. The stiff sidewall construction that provides excellent track performance translates to a firm ride on the street.

I felt every expansion joint, pothole, and rough patch in the road surface. On particularly rough roads, the constant jolts became tiresome during longer drives.

However, compared to some competitors in this category, the RT660 is actually on the more tolerable end of the spectrum. It’s not comfortable, but it’s not brutally harsh either.

Noise Levels

The RT660 generates more road noise than typical performance tires, particularly at highway speeds. The aggressive tread pattern creates a constant hum that’s noticeable but not overwhelming.

In my Mustang, which isn’t the quietest car to begin with, the tire noise blended into the overall driving experience. In a quieter luxury sports car, it might be more intrusive.

Tread Life Expectations

Here’s the trade-off you need to understand: the RT660’s exceptional grip comes at the cost of tread life. With a 200 treadwear rating, this tire will wear faster than typical performance tires.

After several track sessions and regular street driving over my test period, I observed noticeable tread wear. If you’re driving aggressively and attending track days, expect to replace these tires more frequently than you might like.

This is the price of performance. If longevity is your priority, the RT660 isn’t the right choice.

Technical Specifications and Construction

Understanding what makes the RT660 tick helps explain its performance characteristics.

Specification	Details
Tire Type	Extreme Performance Summer
Treadwear Rating	200
Traction Rating	AA
Temperature Rating	A
Available Sizes	15″ to 20″ fitments
Speed Rating	W (168 mph)
Load Range	SL (Standard Load)
Warranty	None (performance tire)

Compound Technology

Falken uses what they call their “extreme silica compound” in the RT660. This compound prioritizes grip over durability, which explains both the tire’s exceptional traction and its accelerated wear rate.

The compound remains pliable across a wide temperature range, contributing to the tire’s consistent performance throughout track sessions.

Construction Features

The RT660 features a rigid bead area and stiff sidewall construction that minimizes flex during hard cornering. This rigidity translates steering inputs directly to the contact patch without the mushiness that can occur with softer tires.

The asymmetric tread pattern optimizes grip with larger outer shoulder blocks for cornering stability and circumferential grooves for wet weather water evacuation.

Competition Comparison: How Does the RT660 Stack Up?

The extreme performance summer tire segment is competitive, with several excellent options vying for enthusiast dollars. Here’s how the RT660 compares to its main competitors.

vs. Bridgestone Potenza RE-71RS

The RE-71RS is often considered the benchmark in this category. In my experience, the RT660 offers comparable dry grip at a lower price point.

The Bridgestone may have a slight edge in absolute peak grip, but the Falken’s more progressive breakaway characteristics make it more forgiving for less experienced track drivers. The RT660 also seems to handle heat cycles better than the RE-71RS.

vs. BFGoodrich g-Force Rival S 1.5

The Rival S 1.5 is another strong competitor that I’ve tested extensively. Both tires offer excellent grip, but they have different characters.

The BFGoodrich feels more planted and predictable at the limit, while the RT660 offers slightly higher peak grip but requires more attention from the driver. For autocross specifically, I’d give a slight edge to the Rival S 1.5, but the RT660 shines on longer road course sessions.

vs. Continental ExtremeContact Force

Continental’s entry into this segment impressed me with its balance of performance and usability. The ExtremeContact Force offers better wet weather capability and arguably more comfortable street manners.

However, the RT660 edges out the Continental in pure dry grip and offers better value in most sizes. For dedicated track use, the Falken is my preference.

Category	RT660	RE-71RS	Rival S 1.5	EC Force
Dry Grip	9.5/10	10/10	9/10	9/10
Wet Grip	6/10	5/10	6/10	7/10
Heat Management	9/10	7/10	9/10	8/10
Tread Life	5/10	4/10	6/10	6/10
Value	9/10	7/10	8/10	8/10

Pricing and Value Assessment

At the time of my testing, the Falken Azenis RT660 ranged from approximately $150 to $280 per tire depending on size. This positions it competitively against the Bridgestone RE-71RS, which typically costs $20-40 more per tire in comparable sizes.

For the performance delivered, I consider the RT660 an excellent value proposition. You’re getting near-top-tier grip at a mid-tier price point.

When calculating the true cost of ownership, remember to factor in the accelerated tread wear. However, since most competitors in this category wear at similar rates, this isn’t a specific disadvantage of the RT660.

Who Should Buy the Falken Azenis RT660?

Based on my extensive testing, I recommend the RT660 for specific types of drivers.

Ideal Candidates

• Track day enthusiasts who attend regular HPDE or time attack events
• Autocross competitors looking for a competitive 200-treadwear tire
• Canyon carvers who prioritize grip on dry roads
• Drivers with a dedicated second set of wheels for performance driving
• Anyone who values outright grip over longevity

Not Recommended For

• Daily drivers who prioritize comfort and tread life
• Drivers in regions with frequent rain or cold weather
• Anyone seeking a mileage warranty
• Budget-conscious buyers who need maximum tire lifespan
• Year-round drivers without plans for seasonal tire changes

Tips for Getting the Most from Your RT660s

After spending considerable time with these tires, I’ve developed some recommendations for maximizing their performance and value.

Proper Break-In

Resist the temptation to immediately attack corners at full speed. Spend the first several days of driving at moderate pace, allowing the release agents from manufacturing to wear off and the compound to reach its optimal state.

Tire Pressure Management

For track use, I found the RT660 responded well to lower pressures than I typically run on the street. Starting with pressures around 32-34 psi cold and adjusting based on temperature readings across the tread provided optimal grip.

On the street, I maintained manufacturer-recommended pressures for safety and even wear.

Rotation Schedule

While traditional rotation patterns apply, I found the front tires wore faster on my rear-wheel-drive car due to steering scrub. Monitor your wear patterns and rotate accordingly to maximize tread life.

Storage Between Seasons

If you’re swapping to winter tires, store your RT660s properly. Keep them in a cool, dry location away from direct sunlight and ozone-generating equipment. Consider tire totes or bags to protect the compound.

My Final Verdict on the Falken Azenis RT660

After extensive testing across multiple driving environments, I can confidently say the Falken Azenis RT660 delivers on its promises. This is a serious performance tire that offers exceptional dry grip, predictable handling at the limit, and impressive heat management during track sessions.

The trade-offs are real — you will sacrifice tread life, wet weather confidence, and ride comfort. But if you understand and accept these compromises, the RT660 rewards you with a driving experience that makes every corner a joy.

For the enthusiast who lives for weekend track days or spirited mountain road drives, I give the Falken Azenis RT660 a strong recommendation. It’s not perfect for everyone, but for its intended audience, it’s nearly perfect.

The RT660 represents Falken’s commitment to the performance driving community, and it shows. They’ve created a tire that bridges the gap between street-legal rubber and racing slicks, giving everyday enthusiasts access to grip levels that were once reserved for dedicated competition tires.

If you’re ready to transform your driving experience and you understand the commitment this tire requires, the Falken Azenis RT660 deserves serious consideration for your next set of performance rubber.

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