McLaren’s shorter gear ratios create trade-off against Mercedes in 2026

McLaren’s decision to run shorter gear ratios in its self-built gearbox is delivering clear acceleration benefits off the line and through slow corners, but costing top speed on long straights, a trade-off that has defined the early 2026 season against Mercedes.

Why it matters:

The gearbox has returned as a performance differentiator under the 2026 regulations, proving that even teams sharing the same power unit can produce very different car behavior. McLaren’s internal design and ratio choices show how critical this component has become.

The details:

• McLaren builds its own gearbox in-house, including all internals, and opted for shorter ratios than Mercedes. This gives stronger acceleration and better launches — data from five races shows the MCL40 consistently out-drags the Mercedes W17 off the line.
• Shorter ratios multiply torque at the driven wheels, especially helpful before the MGU-K engages, and improve acceleration in slower corners. But on long straights, McLaren struggles: in Miami qualifying, eighth gear was too short, leading to a 10+ km/h deficit vs. Mercedes at the end of the back straight.
• In Canada, a low-energy recovery circuit (6 MJ limit), McLaren matched Mercedes on short straights but lost ground on the long run to the final chicane, sometimes exceeding 10 km/h.
• McLaren often uses one gear higher than Mercedes in certain corners (eighth vs. seventh), affecting both lap time and energy recovery opportunities.

What's next:

Team principal Andrea Stella confirmed McLaren is happy with the current setup and not planning to use the one-time rule change on gear ratios. The choice suits the MCL40’s overall philosophy, giving an advantage on tighter circuits. However, on tracks with very long straights and limited energy recovery, Mercedes’ longer ratios offer extra top-speed potential. This balance will shape the battle between the two teams through the season.