Jack Miller believes he has finally “cleared up” the rear vibration issue that compromised his Aragon MotoGP race, after a productive post-race test at MotorLand.
The Pramac Yamaha rider, who finished 14th in the Grand Prix, used the one-day test to investigate the cause of the problem and feels significant progress was made.
“After the disappointments with the vibrations early on in the race, it was nice to test and clear that up,” said Miller. “We went through test items and were able to diagnose the small problem that we were having and understood the issue more deeply.”
Miller was encouraged by the direction Yamaha is heading in, highlighting several components tested during the session:
- Swingarm: A different version was trialed over the weekend, with back-to-back comparisons helping define a clear plan forward.
- Electronics: Updates from Japan were introduced, aiming to refine power delivery and rear grip.
- Aerodynamics: Though Miller didn’t run the new aero during the race due to limited availability, he tested it afterward and noted improved agility and turning.
“No chassis, but pretty much everything else,” he added. “I was pretty happy with the aero. It made the bike more agile.”
As for the engine, Miller noted only a minor evolution compared to the current spec, similar to what Augusto Fernandez ran during the race weekend. “A little step in the same direction,” he described.
Looking ahead, Miller emphasized the importance of Yamaha’s upcoming private test at Barcelona, a track known for low grip – similar to Aragon and Argentina, where Yamaha has struggled.
“These are the tracks where we suffer,” Miller admitted. “So it will be a useful test to understand how we can make the bike work.”
With the vibration issue now behind him and several upgrades showing promise, the Barcelona test marks the next key checkpoint in Yamaha’s 2025 MotoGP development path.
