vs
9.6Display2.4
8.6Build & durability3.7
Dimensions
Size comparison
T-Rex ProForerunner 55
| T-Rex Pro | Forerunner 55 | Difference | |
|---|---|---|---|
| Case size | 47.7 mm | 42 mm | +5.7 mm |
| Thickness | 13.5 mm | 11.6 mm | +1.9 mm |
| Weight | 59 g | 37 g | +22 g |
Drawn to the same scale from the official dimensions (front and side).
Why is T-Rex Pro better than Forerunner 55?
- Water resistance10 ATM vs 5 ATM2×
- AMOLED / OLED displayYes · Forerunner 55: No
- Screen size2″ vs 1.04″+92%
- Resolution (width)800 px vs 208 px3.8×
- Pixel density598 ppi vs 200 ppi3×
- Sport profiles120 vs 158×
Why is Forerunner 55 better than T-Rex Pro?
- Weight59.4 g vs 37 g+61%
- Thickness13.5 mm vs 11.6 mm+16%
Specifications
Side by side
| Design & durability | ||
| Case size | 48 mm | 42 mm |
| Weight | 59.4 g | 37 g |
| Thickness | 13.5 mm | 11.6 mm |
| Height | — | 42 mm |
| Width | — | 42 mm |
| Sapphire crystal | — | No |
| Lens / cover glass | — | chemically strengthened glass |
| Strap material | — | silicone |
| Water resistance | 10 ATM | 5 ATM |
| Water rating (maker) | — | 5 ATM |
| Military-grade (MIL-STD-810) | Yes | — |
| Display | ||
| Screen size | 2″ | 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) | 800 px | 208 px |
| Resolution (height) | 890 px | 208 px |
| Pixel density | 598 ppi | 200 ppi |
| Battery | ||
| Battery life (smartwatch mode) | — | 14 days |
| GPS battery life | — | 20 h |
| Battery capacity | 390 mAh | — |
| Wireless charging | — | No |
| Charging | — | 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 |
| Offline maps | Yes | — |
| Barometric altimeter | Yes | — |
| Compass | Yes | — |
| Sport profiles | 120 | 15 |
| Connectivity | ||
| NFC payments | Yes | — |
| Bluetooth | 5 | — |
| ANT+ sensors | — | Yes |
| Smart features | ||
| Voice assistant | Yes | — |
| Storage | — | 0.03 GB |
| Third-party apps | — | Yes |
| Platform | ||
| Operating system | — | Garmin OS |
| Platform | Proprietary | Proprietary |
| Works with | — | iOS, Android |
