Michelin bans soft rear tyre for Japanese MotoGP after sprint blistering drama

Why Michelin stepped in

Following a frantic Saturday sprint at Motegi, Michelin has withdrawn its soft rear tyre compound from the allocation for Sunday's Japanese Grand Prix. The decision comes after several riders suffered severe tyre blistering and delamination on Motegi's newly resurfaced asphalt.

During the latter stages of the 12-lap sprint, the combination of high grip and low wear caused tyre temperatures to spike dramatically. Pecco Bagnaia was forced to retire with just one lap remaining, while championship leader Jorge Martin finished on the podium but with damaged rear bodywork after his disintegrating soft tyre shattered parts of his bike's rear aerodynamics.

Michelin had anticipated potential heat issues at the demanding Japanese circuit and brought a third, harder-construction rear tyre designed to handle extreme temperatures—similar to the tyre used at the Red Bull Ring. After examining the damage on Saturday evening, the tyre manufacturer chose to ban the soft compound entirely.

The debate over a mandatory hard tyre

While some teams lobbied Michelin to make the special heat-resistant hard tyre mandatory for Sunday's full-length grand prix, the French supplier declined to take that step. Instead, riders will have a choice between the medium and the hard tyre, though Michelin is "strongly suggesting" they use the hard.

Michelin motorsport boss Piero Taramasso explained that certain machines, such as the KTMs and Hondas, manage tyre energy better and had avoided blistering. "We don't want to penalise them and oblige everyone to go with the hard, even if we suggest it very strongly," Taramasso said.

However, opting for the medium remains a significant gamble. KTM's Jack Miller, who was one of only two riders to run the medium during the sprint, reported that his tyre also blistered heavily down the centre. Miller predicted that the grid would end up on the hard tyre anyway, warning that the sudden change could turn Sunday’s race into a lottery.

"All the work we've done throughout the whole weekend is going to be completely wrong," Miller said, noting that teams would have to quickly rewrite their electronics mappings to suit the stiffer carcass.

Scramble in warm-up

The decision is a major headache for teams because no rider had completed a single lap on the hard compound during practice. To help them adapt, Sunday morning's warm-up session has been doubled from the customary 10 minutes to 20 minutes, allowing riders a brief window to evaluate the tyre before the race.

The compromise is a relief for sprint winner Marc Marquez. The Spaniard has historically struggled to find grip with this particular heat-resistant tyre construction, which previously cost him valuable championship ground at the Austrian Grand Prix.