vs
8.0Display2.4
7.9Battery life3.8
8.5Build & durability3.7
Dimensions
Size comparison
T-Rex 2Forerunner 55
| T-Rex 2 | Forerunner 55 | Difference | |
|---|---|---|---|
| Height | 47.1 mm | 42 mm | +5.1 mm |
| Width | 47.1 mm | 42 mm | +5.1 mm |
| Thickness | 13.6 mm | 11.6 mm | +2.1 mm |
| Weight | 66 g | 37 g | +30 g |
Drawn to the same scale from the official dimensions (front and side).
Why is T-Rex 2 better than Forerunner 55?
- GPS battery life50 h vs 20 h2.5×
- Battery life (smartwatch mode)24 days vs 14 days+71%
- Water resistance10 ATM vs 5 ATM2×
- AMOLED / OLED displayYes · Forerunner 55: No
- Sport profiles158 vs 1510.5×
- Screen size1.39″ vs 1.04″+34%
- Resolution (width)454 px vs 208 px2.2×
- Pixel density326 ppi vs 200 ppi+63%
Why is Forerunner 55 better than T-Rex 2?
- Weight66.5 g vs 37 g+80%
- Thickness13.6 mm vs 11.6 mm+18%
Specifications
Side by side
| Design & durability | ||
| Case size | 47 mm | 42 mm |
| Weight | 66.5 g | 37 g |
| Thickness | 13.6 mm | 11.6 mm |
| Height | 47.1 mm | 42 mm |
| Width | 47.1 mm | 42 mm |
| Case material | Plastic / polymer | — |
| Sapphire crystal | — | No |
| Lens / cover glass | Glass material | chemically strengthened glass |
| Strap material | — | silicone |
| Water resistance | 10 ATM | 5 ATM |
| Water rating (maker) | — | 5 ATM |
| Display | ||
| Screen size | 1.39″ | 1.04″ |
| Display technology | AMOLED | Memory-in-pixel (transflective) |
| Panel | AMOLED | Sunlight-visible, transflective memory-in-pixel |
| AMOLED / OLED display | Yes | No |
| Always-on display | — | Yes |
| Touchscreen | Yes | — |
| Resolution (width) | 454 px | 208 px |
| Resolution (height) | 454 px | 208 px |
| Pixel density | 326 ppi | 200 ppi |
| Battery | ||
| Battery life (smartwatch mode) | 24 days | 14 days |
| GPS battery life | 50 h | 20 h |
| GPS battery life (dual-band) | 26 h | — |
| Battery capacity | 500 mAh | — |
| Wireless charging | — | No |
| Charging | Magnetic 2-pin pogo pin | Garmin proprietary plug charger |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | — |
| Sleep tracking | Yes | Yes |
| Sensors | — | GPS, GLONASS, Galileo, Elevate wrist heart rate monitor, Accelerometer |
| Sports & navigation | ||
| Built-in GPS | Yes | Yes |
| Dual-band GPS | Yes | — |
| Satellite systems | — | GLONASS, GALILEO |
| Barometric altimeter | Yes | — |
| Compass | Yes | — |
| Sport profiles | 158 | 15 |
| Connectivity | ||
| Bluetooth | 5 | — |
| ANT+ sensors | — | Yes |
| Smart features | ||
| Storage | — | 0.03 GB |
| Third-party apps | — | Yes |
| Platform | ||
| Operating system | — | Garmin OS |
| Platform | Proprietary | Proprietary |
| Works with | — | iOS, Android |
