vs
3.5Display3.0
4.8Battery life2.8
4.9Health tracking4.9
5.0Sports & outdoor2.4
2.7Build & durability9.3
Dimensions
Size comparison
Forerunner 2559 Peak
| Forerunner 255 | 9 Peak | Difference | |
|---|---|---|---|
| Height | 45.6 mm | 43 mm | +2.6 mm |
| Width | 45.6 mm | 43 mm | +2.6 mm |
| Thickness | 12.9 mm | 10.6 mm | +2.3 mm |
| Weight | 49 g | 62 g | −13 g |
Drawn to the same scale from the official dimensions (front and side).
Why is Forerunner 255 better than 9 Peak?
- Battery life (smartwatch mode)14 days vs 7 days2×
- Dual-band GPSYes · 9 Peak: No
- GPS battery life30 h vs 25 h+20%
- Weight49 g vs 62 g+27%
- Screen size1.3″ vs 1.2″+8%
- Resolution (width)260 px vs 240 px+8%
Why is 9 Peak better than Forerunner 255?
- Water resistance5 ATM vs 10 ATM2×
- Sapphire crystalNo · Forerunner 255: Yes
- Sport profiles58 vs 80+38%
- Thickness12.9 mm vs 10.6 mm+22%
Specifications
Side by side
| Design & durability | ||
| Case size | 46 mm | 43 mm |
| Weight | 49 g | 62 g |
| Thickness | 12.9 mm | 10.6 mm |
| Height | 45.6 mm | 43 mm |
| Width | 45.6 mm | 43 mm |
| Case material | Plastic / polymer | Stainless steel |
| Sapphire crystal | No | Yes |
| Lens / cover glass | Corning® Gorilla® Glass 3 | Sapphire crystal |
| Strap material | silicone | Silicone |
| Water resistance | 5 ATM | 10 ATM |
| Water rating (maker) | 5 ATM | 100 m |
| Display | ||
| Screen size | 1.3″ | 1.2″ |
| Display technology | Memory-in-pixel (transflective) | Memory-in-pixel (transflective) |
| Panel | Sunlight-visible, transflective memory-in-pixel | — |
| AMOLED / OLED display | No | No |
| Always-on display | Yes | — |
| Touchscreen | — | Yes |
| Resolution (width) | 260 px | 240 px |
| Resolution (height) | 260 px | 240 px |
| Pixel density | 200 ppi | 200 ppi |
| Battery | ||
| Battery life (smartwatch mode) | 14 days | 7 days |
| GPS battery life | 30 h | 25 h |
| GPS battery life (dual-band) | 16 h | — |
| Battery type | Lithium ion | rechargeable lithium-ion |
| Wireless charging | No | — |
| Charging | Garmin proprietary plug charger | — |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| Temperature sensor | Yes | Yes |
| HRV tracking | Yes | — |
| Sleep tracking | Yes | Yes |
| Sensors | GPS, GLONASS, Galileo, QZSS, BeiDou, SatIQ technology, Elevate wrist heart rate monitor, Pulse Ox blood oxygen saturation monitor, Barometric altimeter, Compass, Gyroscope, Accelerometer, Thermometer | Optical HR, Barometer, Compass, Thermometer |
| Sports & navigation | ||
| Built-in GPS | Yes | Yes |
| Dual-band GPS | Yes | No |
| Satellite systems | GLONASS, GALILEO, BDS, QZSS | GPS, GLONASS, Galileo, BeiDou, QZSS |
| Barometric altimeter | Yes | Yes |
| Compass | Yes | Yes |
| Multisport / triathlon mode | Yes | Yes |
| Sport profiles | 58 | 80 |
| Connectivity | ||
| NFC payments | Yes | — |
| ANT+ sensors | Yes | — |
| Smart features | ||
| Storage | 4 GB | — |
| Third-party apps | Yes | — |
| Platform | ||
| Operating system | Garmin OS | Suunto OS |
| Platform | Proprietary | Proprietary |
| Works with | iOS, Android | — |
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