Amazfit Cheetah 2 Ultra Wins UTMB 2026: What the Data Shows

Ben Dhiman crossed the UTMB finish line in 2026 wearing an Amazfit Cheetah 2 Ultra, setting the fastest time in the race's history. That's a headline worth stopping at. But here's the full picture: Garmin and COROS still dominate the wrists of the broader field, and four years of tracking data from Montre Cardio GPS tell a more nuanced story about who the pros actually trust when 170 kilometers of Alpine terrain are on the line.

What the Field Actually Wore

Look past the winner and the distribution is familiar. Garmin Fenix and Epix variants, COROS Vertix models, and a smattering of Polar Grit X watches make up the bulk of the field year after year. Amazfit has been gaining ground since the Cheetah Pro launched in 2023, but Dhiman's win is still an outlier in terms of market share at the race. Four years of Montre Cardio GPS data show Garmin hovering around 45 to 50 percent of tracked athletes at UTMB, with COROS taking another 25 to 30 percent. Amazfit sits in the single digits by participation count, which makes a podium win even more striking from a marketing standpoint.

Track accuracy is the metric that matters most at a race like UTMB. GPS drift on technical ridge sections can skew distance by 2 to 4 percent depending on multiband support and satellite system diversity. The Cheetah 2 Ultra uses dual-frequency GPS pulling from GPS, GLONASS, Galileo, and BeiDou simultaneously. COROS Vertix 2S does the same. Garmin's Fenix 8 Solar uses multiband as well, and in back-to-back field tests on Alpine routes, all three sit within about 0.3 percent of each other on total distance. The differences are real but small at that level.

Sensor Setup and Battery Performance

For a 20-plus-hour effort like UTMB, battery life is a genuine constraint, not a spec sheet flex. The Cheetah 2 Ultra claims 90 hours in GPS mode with optical heart rate active. That's the PPG sensor on the wrist reading blood volume changes through light, not the ECG-based electrical signal you'd get from a chest strap like the Garmin HRM-Pro Plus. At race pace, wrist PPG accuracy degrades with arm movement and sweat, which is why serious UTMB athletes often pair any watch with a chest strap for cleaner heart rate data. COROS Vertix 2S claims 140 hours in standard GPS mode. Garmin Fenix 8 Solar sits around 90 hours with solar assist in good conditions. Amazfit's 90-hour figure is competitive but not class-leading on paper.

The Cheetah 2 Ultra also includes a barometric altimeter that reads air pressure changes to calculate elevation gain, which is the right tool for cumulative climbing data on a course like UTMB with roughly 10,000 meters of gain. This is separate from GPS-derived altitude, which is less reliable in steep terrain. All three top competitors use barometric altimeters for this reason. Where Amazfit has made real progress is in the Zepp OS ecosystem and the integration of structured training features that used to feel half-baked compared to Garmin's Connect IQ platform. That gap is narrowing fast, and their [no-subscription-fee commitment for 2026](/en/articles/amazfit-2026-roadmap-more-launches-no-subscription-fees-confirmed-2026-09-03) is a real differentiator.

Comparisons With Garmin and COROS

Garmin remains the benchmark for ecosystem depth. Training load metrics, HRV status, sleep tracking, and third-party app support through Connect IQ are still ahead of what Amazfit offers in day-to-day usability. The [recent Garmin CIRQA firmware update](/en/articles/garmin-cirqa-firmware-update-what-actually-changed-and-why-it-matters-2026-09-03) pushed real-time course correction features that matter for navigation-heavy ultras. COROS counters with a cleaner interface, better battery life across its lineup, and training analytics that have matured significantly since 2023. For pure ultra running without the data science rabbit hole, COROS Vertix 2S is still the rational choice for most athletes in this field.

Whoop doesn't enter this conversation directly since it has no GPS and is a recovery-focused wearable rather than a race watch. Apple Watch Ultra 2 has the hardware for shorter trail events but still falls short on battery for anything beyond 12 to 15 hours of active GPS use. Polar Grit X2 Pro is a legitimate alternative for athletes who prioritize sleep and recovery data alongside training load, but it lags on navigational features compared to Garmin and COROS at similar price points.

What's missing from the Amazfit story at UTMB is depth of adoption among coached and elite athletes outside of sponsored partnerships. Dhiman's win is legitimate and the Cheetah 2 Ultra is a serious watch, but the data ecosystem, coaching tool integrations, and third-party app support still trail Garmin by a meaningful margin. Recovery metrics like HRV trending and readiness scores exist in Zepp OS but lack the longitudinal validation that Garmin's Body Battery or Whoop's recovery model have built up over years of published data. That matters to athletes who make training decisions based on those numbers.

The Amazfit Cheetah 2 Ultra retails around 350 dollars, which undercuts the Garmin Fenix 8 Solar at 900 dollars and the COROS Vertix 2S at 699 dollars by a significant margin. If you're a trail or ultra runner who wants multiband GPS, solid battery life, and no ongoing subscription costs, the Cheetah 2 Ultra is genuinely worth testing. If you're already deep in the Garmin ecosystem or rely on platform integrations for coaching, switching is a bigger ask than the podium result implies. Not the consensus choice. But a real one.