Denny Hamlin will start the NASCAR Cup Series as the rear‑end flag at Iowa Speedway after a cooling unit swap in his Joe Gibbs Racing No. 11.
Joe Gibbs Racing announced the change moments before the green flag, leaving Hamlin, along with Brad Keselowski and Chase Elliott, at the back of the field. The former 2018 Cup champion had a stalled engine during Saturday’s practice and qualifying, forcing the crew to replace a cooling unit with a spare. The new component was installed within the final minutes of pre‑race inspection, but it was unclear whether the adjustment would allow the car to finish the race or maintain competitive speed.
Brake Troubles Affect Multiple Teams
During Saturday’s sessions, both Hamlin and JGR teammate Chase Briscoe faced brake issues at a very early stage of the event. Their problems mirrored the earlier difficulties experienced by the 23XI Racing cars, where three drivers suffered varying degrees of brake pressure loss. James Small, Briscoe’s crew chief, described the brake pads as “destroyed,” a status that exceeds normal wear and cannot be replaced unless NASCAR receives a notification of a defective product from the manufacturer, which has not yet happened.
Chris Gayle, the No. 11 crew chief, stressed that the cooling unit patch offers a 50‑50 chance of carrying the car to the finish while still operating at full capacity. If the solution fails, Hamlin will likely need to enter the garage for additional work before the race begins.
Impact on the 23XI Field
Within the 23XI organization, Riley Herbst is expected to start in the worst shape for the race. Bubba Wallace’s team anticipates being competitive, while Tyler Reddick appears best positioned to run the field without significant issues. The brake damage alluded to in the June testing sessions is attributed to setup choices made by each team based on data supplied under the JGR‑23XI technical alliance. Those teams used the data to refine aggressiveness and learn the car’s behavior in preparation for the subsequent Chase for the Championship.
In short, the cooling unit swap forces Hamlin to the back under disputed reliability. The brake failures put Briscoe and the 23XI drivers in a vulnerable spot, with a tight window for repairs or compromises before the oval’s first lap. The race will now test whether a last‑minute mechanical change can sustain a Cup Series run at Iowa Speedway.
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