Jack Miller, already the lightest among the Yamaha MotoGP riders, has lost an additional two kilograms in preparation for the upcoming 2026 season.
He isn’t the only one from the Yamaha stable aiming for a leaner physique during winter testing; Monster Yamaha’s Fabio Quartararo has also appeared to shed some weight.
In contrast to the Moto3 and Moto2 classes that enforce a minimum combined weight for rider and bike, MotoGP only sets a minimum bike weight of 157kg. Consequently, any reduction in rider weight can enhance performance by reducing mass during acceleration and braking, as well as decreasing frontal area to minimize aerodynamic drag.
However, losing weight needs to be balanced against the crucial requirements of strength and endurance necessary for riding a MotoGP bike effectively over grand prix distances.
Miller’s teammate, Marc Marquez, noticeably appeared lighter ahead of his championship-winning season with factory Ducati, likely encouraging others to pursue a similar path.
On the official MotoGP website, Miller is reported to weigh 64kg, matching Marquez, although Miller is four centimeters taller. During the recent Buriram test, Miller confirmed his two-kilogram weight loss, indicating that he began training with a new coach last December.
“Fitting Back into Moto3”
While Miller didn’t explicitly link his weight loss to the perceived lower top speed of the new Yamaha V4, he humorously mentioned feeling like he’s back in Moto3. He stated, “I’m striving to be in the best shape possible, and I feel fitter than ever heading into a season, aiming to lose weight to enhance bike speed.” This extra speed on the straights would be beneficial, as all four Yamaha bikes ranked low on speed charts in the final pre-season tests.
2026 Yamaha MotoGP Riders: Size and Weight
- Jack Miller: 173cm, 64kg
- Alex Rins: 176cm, 68kg
- Fabio Quartararo: 177cm, 69kg
- Toprak Razgatlioglu: 185cm, 80kg
Aerodynamics and Performance Challenges
Regarding Yamaha’s aerodynamic setup for the new season, Miller expressed that the new design was a clear improvement, and the previous tri-plane style was only retained to ensure enough components were available for the initial races. Despite challenges with the underpowered V4 engine, Miller concluded the test as the top Yamaha rider, finishing 16th overall, just over a second behind rapid contender Marco Bezzecchi.
Miller remains optimistic about pre-season preparation. “The sessions were intense, and we have clear areas for improvement. I’m looking forward to racing, despite knowing this track poses challenges due to numerous long straights,” he mentioned.
Ultimately, Miller emphasized the necessity for timely updates to the bike and praised the engineering team’s efforts, stating, “Creating a bike that’s merely six months old, yet just a second off in lap times, showcases remarkable work.” Engine enhancements are anticipated for the start of the European season.
Support for Toprak Razgatlioglu
On a parallel note, rookie teammate Toprak Razgatlioglu faced difficulties during testing, finishing last on the timesheets. Miller noted the complexity of transitioning to MotoGP for any rookie, especially one as accomplished as Razgatlioglu, and pledged to assist him both on and off the track.
The first practice session for the Thai MotoGP is scheduled for Friday morning.
