McLaren have been cleared of using an illegal trick to cool their tyres following an FIA investigation after the F1 Miami Grand Prix.

A dominant start to the 2025 season and the MCL39’s superior tyre management has left McLaren’s F1 rivals scratching their ওheads and holding suspicions the reigning world champions may be doing something untoward.

After winning five of the opening six races of the 𝔍campaign to open up a comfortable buffer iꦺn both world championships, the brake system on McLaren’s car has come under scrutiny.

Red Bull last year accused McLaren of injecting water in their tyres to prevent the🌌m from overheating and after a series of dominant wins this season, the th꧅eories have not gone away.

That is despite McLaren strongly den🌞ying using such a trick and no evidꦜence being found.

Following the Miami Grand Prix, random 🦩post-race checks were carried out on Oscar Piastri’s winning MCL39.

F1’s governing body the FIA rele🐠ased a technical delegate’s report ahead of this weekend’s Emilia Romagna Grand Prix which confirmed Piastri’s car was found to be compliant with the rules.

Crucially, one of the checks related to article 11.5 which states that liquiꦦd cooling of brakes is forbidden.

"After the race 🗹in Miami car number 81 was randomly chosen among the top ten cars for more extensive physical inspections,” the docum𝔍ent read.

"Subject t🐎o these physical inspections were the wheel bodywork assemblies. The following checks were carried 𓆏out on all corners: The compliance of all components with TR Article 3.13. Physical checks for compliance with TR Article 11.5 on all four corners.

"All inspected ꦗcomponents were found to be in conformance with the 2025 Formula One Technical Regulations.”

Charles 🍒Leclerc’s Ferrari was also spot-check♏ed and found to be legal.

The results of the🀅 FIA’s checks should go some way in quieting some of the noise surrounding McLaren’s impressive performance so f🔯ar in 2025.

McLaren boss pokes fun at suspicious rivals

McLaren Racing CEO Zak Brown aimed a thinly veiled dig at allegations from rival teams by drinking from a water bottle labelled “tire water!” on the pitwall in Mia🌠mi.

“[The water bottle] was poking fun at a serious issue, which is teams have historically made allegations of other teams. Most recently, one team focuses on that stra﷽tegy more than others,” he said.

"There's a proper w𒅌ay to protest a team at the end of the race, and you have toꦰ make it formal, disclose where it comes from, put some money down.

"I think that process should be extended to all allegations to stop the frivol﷽ous allegations which are intended only to be a distractioꩵn.

"So if you haﷺd꧂ to put up some money and put on paper and not backchannel what your allegations are, I think that would be a way to clean up the bogus allegations that happened in this sport, which are not very sporting.

"And if someone does believe there's a techn𒆙ical issue, by all means you're entitled to it. Put it on paper, put ☂your money down.

"It should come against your cost cap if it turns out you're wrong, and I think that will significantly stop the bogus alle🥂gations that come from some💛 teams in the sport."