Garmin Forerunner 255 Hardware Analysis: Why Elite Marathoners Reject Annual Upgrades

By Zac Okafor — Zac Okafor genuinely gets excited about new technology — not as a reflex, but because he follows the underlying trends closely enough to know when something actually changes the trajectory. He asks ‘what’s next?’ in every review: how does this product fit into where the category is heading? If you want to understand how a new gadget connects to the broader arc of innovation, Zac’s your guide. Our Editorial & Safety Standards →

The Garmin Forerunner 255— $249.99 USD on Amazon — is a lightweight, multi-sport GPS running watch engineered to deliver dual-frequency positioning, heart rate variability monitoring, and localized pace telemetry in a stripped-down 48-gram chassis. Released originally at $349.99 USD direct from Garmin, the device targets performance marathoners, endurance athletes, and competitive distance runners who require uncompromising metric accuracy without the weight or battery drain of bright AMOLED displays. The broader arc of hardware design across consumer wearables has pushed aggressively toward luxury touchscreens and smartwatch ambient features, yet elite road racing consistently proves that core sensor telemetry and raw usability trump annual incremental spec bumps.

This dynamic reached a dramatic focal point at the 2026 Amsterdam Marathon when Ethiopian runner Lemi Berhanu claimed victory with a blisteringly fast time of 2:03:33, missing the course record by a razor-thin 3 seconds. According to a Gadgets & Wearables report published after race representatives confirmed the equipment with founder Marko Maslakovic, Berhanu broke away in Vondelpark and stormed into the Olympic Stadium wearing a four-year-old Forerunner 255 on his wrist. In a race where the top three finishers all crossed under 2:04:00 under slick, wet autumn conditions, the winning marathoner relied on a budget-tier mid-range device launched back in June 2022 rather than Garmin’s latest top-tier flagship hardware. This matters because it signals a fundamental shift in how we evaluate wearable technology, highlighting that baseline sensor architecture for running performance effectively stabilized years ago.

Examining official launch documentation and technical specification sheets published during the device’s release cycle reveals why this hardware remains so resilient among world-class athletes. The Forerunner 255 represented a major engineering junction for Garmin when it introduced multi-band GNSS tracking down to its mid-tier line, delivering multi-frequency positioning algorithms previously locked behind elite outdoor hardware. While modern consumer tech marketing attempts to sell users on yearly upgrades, elite marathon results demonstrate that the functional gap between a four-year-old running watch and today’s flagship wearables is largely cosmetic for pure athletic output.

State of the Category & What Changed

The consumer fitness wearable market has undergone a significant architectural split over the past four years. Manufacturers have increasingly prioritized high-brightness AMOLED touchscreens, lifestyle features, voice assistants, and advanced recovery readiness scores derived from complex cloud analytics. Devices like the Garmin Forerunner 265— $449.99 USD on Amazon — were brought to market specifically to satisfy mainstream consumer demand for vivid displays and smartphone-like interactions. However, this aesthetic evolution came at the expense of baseline power efficiency and added visual complexity that does not translate into faster race times.

When analyzing the technical requirements of world-class marathon running, the priorities are starkly different from daily smartwatch usage. A runner moving at a 2:55 per kilometer pace in heavy rain requires instant legibility under direct daylight, physical tactile feedback that works through sweat, and rock-solid GPS distance calculation. Berhanu’s decisive break against Nicholas Kipkorir in the final kilometers of the Amsterdam course required immediate, unambiguous split data. In those critical race windows, screen resolution and smartwatch widget animations offer zero athletic utility.

Furthermore, Berhanu’s victory in Amsterdam is not an isolated anomaly within top-tier distance running. In an earlier analysis covering watches worn at the 2026 London Marathon, women’s winner Tigst Assefa was similarly spotted wearing the exact same Forerunner 255 model during her winning performance. When multiple world-class athletes competing at the sub-2:04 marathon tier voluntarily choose a 4-year-old mid-range watch over multi-hundred-dollar flagship iterations supplied by sponsors, it demonstrates that modern wearable feature creep has outpaced the practical needs of elite performance sports.

Generational Delta: The Engineering Upgrades That Matter

To understand why the Forerunner 255 remains fully viable in modern competition, one must examine its core internal architecture compared to current flagship devices. The watch is built around a 1.3-inch transflective Memory-in-Pixel (MIP) display operating at a 260×260 pixel resolution. Unlike illuminated AMOLED panels that require high-power backlights to fight direct sunlight, MIP technology utilizes incoming light ambient reflections to illuminate the pixel matrix. The brighter the sun shines on the racecourse, the higher the display contrast becomes, all while drawing micro-watts of electrical power from the internal battery.

The primary sensor suite of the Forerunner 255 includes Garmin’s Elevate v4 optical heart rate sensor, a barometric altimeter, a compass, a gyroscope, an accelerometer, and crucially, a multi-band GNSS chip capable of simultaneous L1 and L5 satellite signal tracking. The inclusion of multi-band GPS was the key engineering leap for this generation. By processing dual-frequency signals from GPS, GLONASS, and Galileo satellite constellations, the watch cancels out ionospheric interference and signal reflections caused by tall buildings or dense stadium geometry. In technical documentation published with this release, Garmin highlighted that dual-frequency reception reduces position error down to under 2 meters under difficult conditions, providing precise live pace data that remains completely steady during sharp directional changes.

Physical interaction on the Forerunner 255 is handled entirely through a 5-button interface distributed around the fiber-reinforced polymer bezel. There is no capacitive touchscreen layer bonded to the display glass. During the rain-soaked conditions of the Amsterdam race, a physical button layout provides a distinct structural advantage over capacitive touch control. Touchscreens frequently misinterpret water droplets as finger taps or refuse to swipe when covered in sweat. Physical mechanical switches deliver crisp, unmistakable tactile actuation, allowing a runner to manually split a lap or toggle data fields without glancing down or worrying about screen lock states.

Power management represents another key architectural win for this legacy platform. According to technical documentation, the watch delivers up to 30 hours of continuous tracking in standard single-system GPS mode, and up to 16 hours in full multi-band, all-systems satellite mode. Because the marathon distance takes elite runners around two hours and recreational runners between three and five hours, a 16-hour multi-band operational window means the battery discharge rate during a race is under 15%, operating well within the optimal voltage curve of the internal lithium-ion cell without throttling processing clock speeds.

Everyday Usability Trade-Offs & Adoption Barriers

While the Forerunner 255 continues to dominate pure athletic performance scenarios, everyday consumer adoption involves genuine physical compromises. The transflective MIP display, while superior in full sunlight, appears dim, flat, and visually dated in low-light indoor environments compared to modern OLED panels. Users accustomed to vibrant smartwatch interfaces, fluid 60Hz UI animations, and rich color depth will find the static 64-color palette of the MIP panel austere. Indoor visibility requires activating the dedicated LED backlight, which lacks the auto-brightness refinement seen on contemporary smartwatches.

Software feature gating across generations presents another hurdle for casual buyers looking at older hardware. Garmin has reserved its latest training metrics, such as real-time stamina tracking, advanced training readiness scoring, and color topographic mapping, for its higher-tier Forerunner 900-series and newer flagship models. The Forerunner 255 relies on breadcrumb trail navigation without background map rendering, which poses a clear usability limit for trail runners or outdoor adventure athletes who need detailed geographic topography directly on their wrist during long off-road navigation.

The one critical detail the official spec sheet buries in the footnotes involves long-term battery degradation over multi-year lifespans. A watch launched four years ago that has undergone regular charge-discharge cycles will experience natural lithium-ion capacity loss, typically degrading total cell capacity by 15% to 20% after 500 complete cycles. However, because the baseline power consumption of a non-AMOLED MIP watch is so low, even a degraded Forerunner 255 retains enough battery overhead to comfortably complete a full marathon with multi-band GPS engaged, mitigating the real-world impact of battery aging far better than high-draw AMOLED alternatives.

For buyers outside the core running domain, the lack of modern smartwatch conveniences creates immediate friction. The watch features basic notification mirroring from connected iOS or Android smartphones, but lacks a microphone or speaker for taking wrist calls, offers limited third-party app support through Garmin Connect IQ, and omits touchscreen swipe gestures. Users seeking an all-in-one lifestyle assistant that balances fitness tracking with cellular connectivity, voice interactions, and high-resolution media control will find the bare-bones, utility-first design of the Forerunner 255 far too limiting for daily desk wear.

Category Alternatives and Rival Solutions

For athletes evaluating the pure endurance performance category today, several direct competitors offer specialized alternatives to Garmin’s mid-tier ecosystem. The COROS Pace 3— $229.00 USD on Amazon — represents one of the strongest rival options in the lightweight sports watch segment. Weighing just 30 grams with a nylon band, the Pace 3 features a 1.2-inch memory-in-pixel display, dual-frequency satellite positioning, and an optical heart rate sensor array. COROS has built a reputation for outstanding battery optimization, claiming up to 38 hours of continuous standard GPS tracking and 15 hours in dual-frequency mode, making it a compelling alternative for runners who prioritize minimal wrist mass and budget efficiency.

In contrast to traditional MIP-based sports watches, major mobile manufacturers are attempting to capture the endurance market with higher-end display technology. The Huawei Watch GT Runner 2— $299.99 USD on Amazon — takes an opposing architectural path. As noted in recent race coverage detailing how Eliud Kipchoge won the Melbourne Marathon wearing the Huawei Watch GT Runner 2, this device combines a high-brightness AMOLED panel with a custom dual-band antenna system built directly into the composite watch lugs. Huawei’s approach aims to offer crisp visual fidelity and high-contrast mapping without sacrificing GPS tracking performance, appealing to runners who demand modern display tech alongside competitive marathon metrics.

Comparing these options highlights the clear divide in consumer preferences within the fitness category:

• Garmin Forerunner 255 ($249.99 USD on Amazon): Proven elite marathon track record, 48 grams, 5-button tactile control, transflective MIP daylight legibility, and 16 hours multi-band GPS battery life. Ideal for runners focused entirely on Firstbeat ecosystem training data and physical button reliability.
• COROS Pace 3 ($229.00 USD on Amazon): Ultra-lightweight 30-gram housing, 38 hours standard GPS battery life, MIP display, and aggressive pricing. Best suited for runners who want maximum battery longevity in the lightest possible physical form factor.
• Huawei Watch GT Runner 2 ($299.99 USD on Amazon): High-brightness AMOLED screen, custom lug-integrated antenna design, and modern smartwatch aesthetic. Designed for athletes who want vivid visuals and modern smartwatch features alongside marathon-grade tracking capability.

Final Trajectory Verdict: Future Outlook & Buying Advice

The victory of Lemi Berhanu at the Amsterdam Marathon using a four-year-old running watch provides a clear diagnostic on the current state of fitness hardware. We have reached a point of diminishing returns for core athletic metric collection. Multi-band GPS tracking, optical heart rate sampling, and running power calculations reached operational maturity during the 2022 product generation. Unless a runner requires high-definition topographical maps, an AMOLED display, or specialized recovery metrics, paying a premium for annual hardware refreshes yields virtually no measurable advantage on race day.

What’s next for this category? If this current generation of fitness wearables successfully establishes that sensor accuracy has plateaued, the next architectural leap will likely revolve around ultra-low-power hybrid display technology and ambient energy harvesting. If future iterations can seamlessly combine micro-LED brightness with passive solar-assisted MIP reflectivity, manufacturers could eliminate battery anxiety entirely during ultra-endurance events without compromising indoor readability. Until that transition occurs, buying or holding onto a battle-tested device like the Garmin Forerunner 255— $249.99 USD on Amazon — remains one of the smartest, most cost-effective decisions any serious runner can make.