Garmin Forerunner 255 vs Forerunner 255S
Size, specs & wrist fit compared
Which one fits you
Under 16.5 cm (6.5 in) round, the 45.6mm's lugs overhang and the 41mm's do not; the 41mm fills the wrist at 15.5–17 cm, the 45.6mm at 17–19 cm.
What else differs
- Screen: the 45.6mm has the larger screen, 1.3 in across against 1.1 in on the 41mm.
- Battery: 14 days for the 45.6mm against 12 days for the 41mm in everyday use; 30 hours for the 45.6mm against 26 hours for the 41mm with GPS on.
The Forerunner 255 is 4.6mm wider, 0.5mm thicker and 10g heavier than the Forerunner 255S.
Forerunner 255
Forerunner 255S
Forerunner 255: 45.6mm or 41mm by wrist size
| Wrist round (mm left each side) | 45.6mm≈52.5mm lug to lug, est. | 41mm≈47mm lug to lug, est. |
|---|---|---|
| 14 cm / 5.5 in | Overhangs (3.7mm over) | Overhangs (0.9mm over) |
| 15 cm / 5.9 in | Overhangs (2.1mm over) | Bold (0.7mm) |
| 16 cm / 6.3 in | Overhangs (0.4mm over) | Sweet spot (2.3mm) |
| 17 cm / 6.7 in | Bold (1.2mm) | Sweet spot (3.9mm) |
| 18 cm / 7.1 in | Sweet spot (2.8mm) | Balanced (5.5mm) |
| 19 cm / 7.5 in | Sweet spot (4.4mm) | Balanced (7.1mm) |
| 20 cm / 7.9 in | Balanced (6mm) | Balanced (8.8mm) |
Switch or add watches
Garmin
Forerunner 255
Garmin
Forerunner 255S
As an Amazon Associate, WatchFitTool earns from qualifying purchases.
Battery life compared
Furthest apart in All systems mode, where the Forerunner 255 lasts 1.3× as long as the Forerunner 255S (25 hours against 20 hours).
Forerunner 255Forerunner 255S
Smartwatch
14 days12 daysGPS only
30 hours26 hoursAll systems
25 hours20 hoursAll systems + multi-band
16 hours13 hours
2D Dimension Schematics
- Garmin Forerunner 255 45.6mm × ≈52.5mm (est.) · 12.9mm thick
- Garmin Forerunner 255S 41mm × ≈47mm (est.) · 12.4mm thick
3D preview
Forerunner 255 vs Forerunner 255S on a wrist
Specifications
The short version
7 key specs| Spec | GarminForerunner 255 | GarminForerunner 255S |
|---|---|---|
| Case Width | 45.6mm | 41mm |
| Thickness | 12.9mm | 12.4mm |
| Weight | 49g | 39g |
| Shape | Circular | Circular |
| Display type | Sunlight-visible, transflective memory-in-pixel (MIP) | Sunlight-visible, transflective memory-in-pixel (MIP) |
| Battery life | Smartwatch mode: Up to 14 days GPS-Only GNSS mode: Up to 30 hours All-Systems GNSS mode: Up to 25 hours All-Systems GNSS mode plus Multi-Band: Up to 16 hours See Details | Smartwatch mode: Up to 12 days GPS-only GNSS mode: Up to 26 hours All-Systems GNSS mode: Up to 20 hours All-Systems GNSS mode plus Multi-Band: Up to 13 hours See Details |
| Released | 2022 | 2022 |
Where the specifications differ
11 differences| Spec | Garmin Forerunner 255 | Garmin Forerunner 255S |
|---|---|---|
| General | ||
| Battery life | Smartwatch mode: Up to 14 days GPS-Only GNSS mode: Up to 30 hours All-Systems GNSS mode: Up to 25 hours All-Systems GNSS mode plus Multi-Band: Up to 16 hours See Details | Smartwatch mode: Up to 12 days GPS-only GNSS mode: Up to 26 hours All-Systems GNSS mode: Up to 20 hours All-Systems GNSS mode plus Multi-Band: Up to 13 hours See Details |
| Display Size | 1.3" (33 mm) diameter | 1.1" (27.5mm) Diameter |
| Display resolution | 260 x 260 pixels | 218 x 218 pixels |
| Quick Release bands | yes (22 mm, Industry standard) | yes (18 mm, Industry standard) |
| Product Info | ||
| Main SKU | 010-02641-01 | 010-02641-02 |
| Product ID | 780139 | 780165 |
| Product Name | Forerunner® 255 | Forerunner® 255S |
| Product Variation | Tidal Blue | Powder Gray |
| Running Features | ||
| Lactate threshold | Yes | yes (with compatible accessory) |
| What You'll Love | ||
| Battery life (smartwatch mode) | Up to 14 days | Up to 12 days |
| Swimming Features | ||
| Heart rate from external HRM (real-time during rests, interval and session stats during rests, and automatic heart rate download post-swim) | yes (with HRM-Swim, HRM-Pro, HRM-Pro Plus or HRM 600) | yes (with HRM-Swim, HRM-Pro or HRM-Pro Plus) |
The other 191 specifications both list are identical.
Full Garmin Forerunner 255 specifications →Full Garmin Forerunner 255S specifications →