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The IndyCar Series is making an adjustment to its tire allocation rules in 2025 where its partners at Firestone will provide an extra set of higher-grip alternate tires and remove one set of primar…
In 2025, the IndyCar Series will adjust its tire allocation rules in partnership with Firestone, adding an extra set of high-grip alternate tires and removing one set of primary tires at most road and street courses. Previously, Firestone provided four sets of alternates and six sets of primaries, but for the upcoming season, it will be an equal split of five sets each. Exceptions to this split include the high-wear road course at The Thermal Club and the Indianapolis road course event, which will maintain the 4-6 apportioning from 2024 due to specific requirements. Other tire rules from 2024 remain unchanged, such as the allowance of using an alternate set during practice sessions and providing an extra set of primaries for rookies. Additionally, IndyCar requested Firestone to create a wider performance gap between primary and alternate tires to enhance competition and strategy. The adjustments aim to offer teams more control over tire strategy and foster closer racing in the series according to drivers like Colton Herta.
