Garmin Tactix 8 47mm AMOLED vs Tactix 8 51mm Solar
Size, specs & wrist fit compared
Which one fits you
Under 18 cm (7.1 in) round, the Tactix 8 51mm Solar's lugs overhang and the Tactix 8 47mm AMOLED's do not; the Tactix 8 47mm AMOLED fills the wrist at 17.5–19.5 cm, the Tactix 8 51mm Solar at 19 cm and up.
What else differs
- Screen: the Tactix 8 47mm AMOLED uses a bright AMOLED screen, the Tactix 8 51mm Solar a memory-in-pixel screen that is easy to read in sunlight and sips battery.
- Battery: 30 days for the Tactix 8 51mm Solar against 16 days for the Tactix 8 47mm AMOLED in everyday use; 4.0 days for the Tactix 8 51mm Solar against 47 hours for the Tactix 8 47mm AMOLED with GPS on.
1.6mm thinner, the Tactix 8 47mm AMOLED is the one that slides under a shirt cuff.
The Tactix 8 51mm Solar is 4mm wider, 1.6mm thicker and 22g heavier than the Tactix 8 47mm AMOLED.
Tactix 8 47mm AMOLED
Tactix 8 51mm Solar
Case width
47mm
51mm+4mm
Thickness
13.8mm
15.4mm+1.6mm
Weight
73g
95g+22g
Tactix 8 47mm AMOLED or Tactix 8 51mm Solar by wrist size
| Wrist round (mm left each side) | Tactix 8 47mm AMOLED≈54mm lug to lug, est. | Tactix 8 51mm Solar≈58.5mm lug to lug, est. |
|---|---|---|
| 14 cm / 5.5 in | Overhangs (4.4mm over) | Overhangs (6.7mm over) |
| 15 cm / 5.9 in | Overhangs (2.8mm over) | Overhangs (5.1mm over) |
| 16 cm / 6.3 in | Overhangs (1.2mm over) | Overhangs (3.4mm over) |
| 17 cm / 6.7 in | Bold (0.4mm) | Overhangs (1.8mm over) |
| 18 cm / 7.1 in | Sweet spot (2mm) | Overhangs (0.2mm over) |
| 19 cm / 7.5 in | Sweet spot (3.6mm) | Bold (1.4mm) |
| 20 cm / 7.9 in | Balanced (5.3mm) | Sweet spot (3mm) |
Switch or add watches
Garmin
Tactix 8 47mm AMOLED
Garmin
Tactix 8 51mm Solar
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Battery life compared
Furthest apart in Expedition mode, where the 51mm Solar lasts 2.9× as long as the 47mm AMOLED (50 days against 17 days).
47mm AMOLED51mm Solar
Expedition
17 days50 days +118 daysBattery saver
23 days48 days +107 daysSmartwatch
16 days30 days +48 daysMax battery GPS
81 hours186 hours +653 hoursGPS only
47 hours95 hours +149 hoursAll systems
38 hours68 hours +92 hoursAll systems + multi-band
35 hours52 hours +65 hoursAll systems with music
10 hours18 hours
Amber figures are the solar-assisted runtime the manufacturer publishes for that mode.
More comparisons
2D Dimension Schematics
- Garmin Tactix 8 47mm AMOLED 47mm × ≈54mm (est.) · 13.8mm thick
- Garmin Tactix 8 51mm Solar 51mm × ≈58.5mm (est.) · 15.4mm thick
3D preview
Tactix 8 47mm AMOLED vs Tactix 8 51mm Solar on a wrist
Specifications
The short version
7 key specs| Spec | GarminTactix 8 47mm AMOLED | GarminTactix 8 51mm Solar |
|---|---|---|
| Case Width | 47mm | 51mm |
| Thickness | 13.8mm | 15.4mm |
| Weight | 73g | 95g |
| Shape | Circular | Circular |
| Display type | AMOLED | Sunlight-visible, transflective memory-in-pixel (MIP) |
| Battery life | Smartwatch: Up to 16 days (7 days always-on) Battery Saver Watch Mode: Up to 23 days GPS Only: Up to 47 hours (37 hours always-on ) All Satellite Systems: Up to 38 hours (30 hours always-on) All Satellite Systems + Multi-band: Up to 35 hours (28 hours always-on)* All Satellite Systems + Music: Up to 10 hours Max Battery GPS: Up to 81 hours Expedition GPS: Up to 17 days *Assuming typical use with SatIQ technology | Smartwatch: Up to 30 days/48 days with solar* Battery Saver Watch Mode: Up to 48 days/107 days with solar* GPS Only: Up to 95 hours/149 hours with solar** All Satellite Systems: Up to 68 hours/92 hours with solar** All Satellite Systems + Multi-band: Up to 52 hours/65 hours with solar*** All Satellite Systems + Music: Up to 18 hours Max Battery GPS: Up to 186 hours/653 hours with solar** Expedition GPS: Up to 50 days/118 days with solar* *Solar charging, assuming all-day wear with 3 hours per day outside in 50,000 lux conditions **Solar charging, assuming use in 50,000 lux conditions ***Solar charging, assuming use in 50,000 lux conditions; assuming typical use with SatIQ technology |
| Released | 2025 | 2025 |
Where the specifications differ
10 differences| Spec | Garmin Tactix 8 47mm AMOLED | Garmin Tactix 8 51mm Solar |
|---|---|---|
| General | ||
| Battery life | Smartwatch: Up to 16 days (7 days always-on) Battery Saver Watch Mode: Up to 23 days GPS Only: Up to 47 hours (37 hours always-on ) All Satellite Systems: Up to 38 hours (30 hours always-on) All Satellite Systems + Multi-band: Up to 35 hours (28 hours always-on)* All Satellite Systems + Music: Up to 10 hours Max Battery GPS: Up to 81 hours Expedition GPS: Up to 17 days *Assuming typical use with SatIQ technology | Smartwatch: Up to 30 days/48 days with solar* Battery Saver Watch Mode: Up to 48 days/107 days with solar* GPS Only: Up to 95 hours/149 hours with solar** All Satellite Systems: Up to 68 hours/92 hours with solar** All Satellite Systems + Multi-band: Up to 52 hours/65 hours with solar*** All Satellite Systems + Music: Up to 18 hours Max Battery GPS: Up to 186 hours/653 hours with solar** Expedition GPS: Up to 50 days/118 days with solar* *Solar charging, assuming all-day wear with 3 hours per day outside in 50,000 lux conditions **Solar charging, assuming use in 50,000 lux conditions ***Solar charging, assuming use in 50,000 lux conditions; assuming typical use with SatIQ technology |
| Lens Material | sapphire crystal | Power Sapphire™ |
| Display resolution | 454 x 454 pixels | 280 x 280 pixels |
| QuickFit® watch band compatible | included (22 mm) | included (26 mm) |
| Product Info | ||
| Main SKU | 010-03405-00 | 010-03407-00 |
| Product ID | 1828661 | 1828741 |
| Product Name | tactix® 8 – 47 mm, AMOLED | tactix® 8 – 51 mm, Solar |
| What You'll Love | ||
| Display type | AMOLED | Sunlight-visible, transflective memory-in-pixel (MIP) |
| Battery life (smartwatch mode) | Up to 16 days (7 days always-on) | Up to 30 days (48 days with solar*) |
| Outdoor Recreation | ||
| Preloaded road and trail maps | yes (Sapphire Editions only) | Yes |
The other 337 specifications both list are identical.
Full Garmin Tactix 8 47mm AMOLED specifications →Full Garmin Tactix 8 51mm Solar specifications →