In typical riding conditions, the 2025 Honda Grom tops out around 60 mph (about 96 km/h). With a lighter rider and optimal conditions, some riders may reach the mid‑60s mph, while heavier riders or headwinds can keep speeds lower.
Speed factors and official figures
Several factors determine the Grom’s top speed, including engine output, gearing, rider position, and road conditions. Honda provides engine specifications, but the company does not publish a universal top-speed figure for every model year. Here are the core details that influence speed:
Engine power and gearing
- Engine: 125cc air‑cooled single with practical output around 9.7 horsepower (roughly 7.2 kW) and about 6–7 Nm of peak torque.
- Transmission: 4‑speed manual with a short final drive that prioritizes low‑speed responsiveness and economy over ultimate top speed.
- Powerband: Peak power occurs around 7,000 rpm, with usable torque through mid‑range; top speed is reached in upper gears when the engine is near redline.
Takeaway: The Grom’s performance is tuned for urban riding rather than high‑speed highway overtakes, so top speed is limited by gearing and power delivery.
Real-world performance and rider reports
Real‑world speeds vary with rider weight, wind, altitude, and tire condition. Independent riders and media tests typically place the Grom in the 60 mph neighborhood on flat ground with a standard rider, with a few reports pushing into the mid‑60s mph under ideal conditions.
- Typical rider (~150 lb / 68 kg) on a flat road with light wind: approximately 58–62 mph (93–100 km/h).
- Lighter rider or favorable conditions (tailwind, smooth surface): about 60–65 mph (97–105 km/h), occasionally reaching the mid‑60s mph in pure straight‑line tests.
- Heavier rider, headwinds, or climbs: roughly 55–58 mph (88–93 km/h) or lower depending on incline and air density.
These figures reflect consumer and tester experiences rather than an official claim from Honda. Real‑world results will vary by conditions and rider weight.
Summary
The 2025 Honda Grom is built for nimble urban riding rather than high speed. In typical conditions, you should expect about 60 mph, with a possible range from the mid‑50s to the mid‑60s mph depending on rider weight, wind, altitude, and road grade. For most riders, that translates to solid city‑to‑highway performance and strong acceleration in traffic.