Jack Miller has successfully addressed a rear vibration problem that affected his performance at the Aragon MotoGP weekend during the post-race MotorLand test. The Pramac Yamaha rider, who finished 14th at the Aragon Grand Prix, used the test to better understand and resolve the issue ahead of an important upcoming test in Barcelona.
Insights from the Post-Race Aragon Test
During the one-day test after the Aragon race, Miller said he was able to identify the cause of the vibrations that troubled him.
“After the disappointments with the vibrations early on in the race, it was nice to test and clear that up,”
he said. He confirmed that the team went through various test items and pinpointed the small problem that had been disrupting his bike’s performance, gaining a clearer understanding.
Miller viewed the testing positively, feeling confident about the direction Yamaha is moving.
“Testing a few items was good,”
he said.
“We are going the right way.”
After a short break, he planned to return to the bike for the Barcelona test, a circuit where his team faces challenges with long corners, making it an ideal location to continue development.
Details on Yamaha’s New Components and Setup
Miller revealed that the test focused on a range of updates, excluding the chassis but including other components such as a swingarm, electronics, and aerodynamics. The swingarm used during the weekend differed from the one tested afterward as Yamaha aimed to develop a future plan. In terms of electronics, the team is gathering updates from Japan to improve strategy and overall performance.
Regarding aerodynamics, Miller noted seeing teammate Fabio Quartararo using the latest aero parts. He chose not to use that during the Aragon race to avoid risking damage, as only one unit was available.
“I was pretty happy with it. It helped with turning. It made the bike more agile,”
Miller stated on the aerodynamic improvements.
Testing the new engine package showed modest gains. Miller explained the latest engine, which was also tested by Augusto Fernandez that weekend, represented
“a little step in the same direction”
compared to what he had been running since Jerez.
Preparing for the Barcelona Test Ahead
Looking forward, Miller emphasized the importance of Yamaha conducting private tests at circuits like Barcelona, where track grip remains a challenge. He compared the Circuit de Barcelona-Catalunya to MotorLand Aragon, highlighting their similarity in terms of surface conditions and the difficulties they present for his setup.
“Similar in terms of bad grip,”
he said.
“These two [tracks] are pretty close. These are the tracks where we suffer.”
Miller added that the team struggles the most at venues like Argentina, where rear grip is limited. He sees the upcoming Barcelona test as a key opportunity to analyze the bike’s behavior and find solutions.
“So it will be a useful test to understand how we can make the bike work.”
