Aggressive Setups and Driving Tactics Fuel Tire Woes at Phoenix, Experts Reveal

Phoenix Raceway, a venue renowned for its demanding asphalt and strategic challenges, played host to a NASCAR Cup Series race where tire issues became a prominent storyline. While the immediate reaction might be to point a finger at "tire failure," veteran crew chiefs and industry analysts suggest a more nuanced reality: the aggressive pursuit of performance by teams and drivers themselves is a significant, if not primary, contributor to these on-track incidents.

The delicate equilibrium between maximizing grip and ensuring tire longevity is a constant battle for NASCAR teams. Joe Gibbs Racing No. 20 crew chief Adam Stevens, speaking on SiriusXM NASCAR Radio, articulated this inherent tension. "It’s so tough," Stevens admitted with a chuckle. "It’s just a quirk of our sport that the fans don’t understand. We just don’t know the load, air pressure and camber combination with certainty where we’re going to have a problem."

Stevens elaborated on the fundamental physics at play. "What we do know is generally the tires make the most grip at higher camber settings and they last the longest at lower air pressure settings so, those two material facts are polar opposites of working together," he explained. This creates a scenario where the only way to truly ascertain the performance ceiling of a tire, without risking a catastrophic failure, is to push right up to, or even slightly over, that limit. "You can think you know but you don’t know until you cross it or somebody else crosses it and you know exactly what they have going on," Stevens added.

For competitors like Stevens, the strategy involves a calculated gamble. He aims to "sneak up" on the performance edge, hoping any transgression occurs early enough in the race that his team has time to adjust and recover. "It’s a quirky part of the sport and I don’t know how to get around it," he stated. While practice sessions allow teams to analyze tire wear and Goodyear to inspect them for internal issues, the dynamic race environment introduces variables that practice cannot fully replicate.

Related News :

The core of the problem, Stevens elucidated, lies in tires being "overloaded for a sustained amount of time." This load naturally decreases as lap times slow and air pressures increase. However, the inherent variability in tire construction, given that they are "laid up by hand, made by humans, not machines," can lead to unpredictable outcomes. Even identical setups in practice might perform differently in the race, leading to unexpected tire distress.

Rudy Fugle, crew chief for William Byron’s Hendrick Motorsports No. 24 team, echoed these sentiments, highlighting the critical role of tire pressure in driver feel and performance. "The reason we want to go lower is — for most of the time, especially with this really short sidewall — as the driver leans the car into the corner, that sidewall has a ton of flex, and gives the driver a ton of feel before he goes from spinning out to tight," Fugle explained. This sidewall flex provides crucial feedback, allowing drivers to make micro-adjustments and avoid critical errors.

The introduction of the NextGen car, with its shorter sidewall, has amplified this challenge. "With this NextGen, with its shorter sidewall, this tire has way less so the driver is on edge," Fugle noted. This reduction in sidewall compliance was a factor in the increased frequency of "snappy-spins" observed during the NextGen car’s inaugural season in 2022, as drivers adapted to the altered feedback loop.

Fugle continued, "So the lower air pressure gives that sidewall way more flex, way more feel." He also pointed out that lower air pressure generally correlates with longer tire life under optimal conditions. "When you have a tire that digs, the low air pressure generally means it survives way longer, so you make it a 60-lap run and it just survives a lot longer," he said. Consequently, teams are incentivized to push tire pressures to their absolute limits in search of that performance advantage. "So we want to push down to those limits and we have gotten to where we kind of have a calculation of trying to know, like air pressure, load (and) camber; what we can do."

It’s important to remember that tire air pressure naturally increases as a run progresses, irrespective of the starting point. However, lower initial air pressure also enhances the tire’s contact patch and overall mechanical grip, a desirable trait for speed.

Todd Gordon, a seasoned crew chief now serving as a broadcast analyst, also weighed in on the driver’s role in tire management. Hosting his own show on SiriusXM, Gordon emphasized that drivers bear a degree of responsibility in preserving the setups provided to them. He recounted a conversation with Joey Logano, where Gordon offered to lower tire pressures if Logano committed to a more conservative driving style for a period. "I had a conversation with Joey (Logano) and told him that I could go lower (on air pressure) if you commit to me that you’re not going to pass anyone on the backstretch for four laps," Gordon stated. This illustrates how driver aggression and race strategy directly impact tire longevity.

The specific characteristics of Phoenix Raceway, particularly its apron and restart procedures, can exacerbate tire wear. Gordon highlighted how drivers can utilize a shortcut by cutting across the apron, a maneuver that can shock the tires and accelerate degradation. "At Phoenix, drivers can use the short cut by cutting across the apron on the restart, and that can shock the tires into an eventual degradation process too," he observed.

Gordon expanded on the multifaceted nature of tire management: "So yes, camber is one, air pressure becomes one, how you install where you choose to be aggressive, how much load you’ve got into the setup, how much it shocks the load," he listed. "And then, how aggressive your driver is." He further described Phoenix as a circuit where drivers are tempted to "bail off and shorten the dog leg on cold tires first lap at speed," leading to a "brutal transition both down and back onto the race surface." The visible sparks emanating from the cars underscore the extreme forces at play.

Historically, Goodyear has produced more durable tires, which, while reducing tire failures, arguably hampered the on-track product by creating less dynamic racing. The industry’s shift over the past three years, towards tires that offer more grip and reward aggressive driving, has necessitated a greater acceptance of risk by teams. As industry experts suggest, this evolution means that teams and drivers must now shoulder more responsibility for tire issues, rather than solely attributing them to the tire manufacturer. This trade-off has, by many accounts, improved the racing spectacle, allowing crew chiefs and drivers to pursue higher rewards through increased risk-taking throughout a race weekend.