Toto Wolff Highlights McLaren's 'Very Different' Gear Ratio Choices Amid Power Unit Debate

Mercedes Team Principal Toto Wolff pointed to "very different" technical choices, specifically gear ratios, as a key reason why customer team McLaren may not be extracting the same performance from their Mercedes power unit. This comes amid public comments from McLaren and Williams about a potential performance gap to the works Mercedes team, which Wolff suggests is more about integration and concept than withheld information.

Why it matters:

The dynamic between a works team and its customers is a delicate balance of collaboration and competition. Public discussions about performance disparities can strain these relationships. Wolff's technical explanation aims to deflect claims of unfair advantage, framing the gap as a result of independent engineering choices rather than a lack of support, which is crucial for maintaining trust among all teams using Mercedes engines.

The details:

• Customer Team Concerns: Following the Australian Grand Prix, McLaren team principal Andrea Stella and Williams hinted at a possible performance deficit, with Stella citing a need for more information from Mercedes High Performance Powertrains (HPP) to fully understand the PU.
• Wolff's Defense: Wolff has consistently defended Mercedes' approach, stating all customer teams receive identical hardware and software. After Sprint qualifying in Shanghai, he emphasized the natural advantage works teams have in early integration and learning.
• The Gear Ratio Example: Wolff identified one concrete area of difference: "With the McLaren, without going into the detail, they have taken some decisions that are very different to ours, when it comes, for example, to gear ratios." He acknowledged this choice could have been good or bad, but it illustrates divergent car concepts.
• McLaren's Progress: Andrea Stella acknowledged signs of improvement in Shanghai, specifically in McLaren's understanding of how to use the power unit during qualifying. This led to a reduced gap to Mercedes compared to Melbourne, with Lando Norris qualifying third for the Sprint.
• The Works Team Edge: Wolff pointed to Mercedes and Ferrari as examples of integrated structures (chassis and engine built together) having an inherent early-development advantage, a benefit Audi will also have when it enters in 2026.

What's next:

The focus now shifts to how quickly customer teams like McLaren can optimize their package. Wolff expressed full confidence that McLaren's "formidable structure" will close the gap in time. The Chinese Grand Prix Sprint and main race will provide more data on whether McLaren's improved understanding translates to consistent race pace. This technical dialogue will likely continue behind the scenes as all Mercedes-powered teams seek to unlock more performance from the same base hardware.