Garmin Forerunner 165 vs Suunto 9 Peak Pro
Quick verdict
Choose the Garmin Forerunner 165 if…
- You mostly race up to mountain-marathon distance and train on plans
- You want the lightest, cheapest watch in the Garmin Connect ecosystem
Choose the Suunto 9 Peak Pro if…
- You're moving up to ultras and need 40 h of battery
- You run in deep valleys or dense forest where multi-band accuracy matters
For maximum autonomy on long ultras, Suunto 9 Peak Pro lasts longer in GPS mode. If you want the lightest watch on your wrist, go for Garmin Forerunner 165. On budget, Garmin Forerunner 165 is the more affordable option.
Garmin Forerunner 165 or Suunto 9 Peak Pro? GPS battery (19 h vs 40 h), weight (39 g vs 64 g), maps and multi-band, with a clear verdict and a check of whether each lasts your whole race.
Pick by what you need
- If you run ultras or very long outings (40 h of GPS) → Suunto 9 Peak Pro
- If you want the lightest (39 g) → Garmin Forerunner 165
- If you want to save without giving up the essentials → Garmin Forerunner 165
Radar: where each watch wins
Absolute 0–100 scale, no exaggerated gaps: a tie stays a tie. Tied on 2 of 6 axes.
| Axis | Garmin Forerunner 165 | Suunto 9 Peak Pro |
|---|---|---|
| GPS battery | 16/100 | 33/100 |
| Everyday battery | 37/100 | 27/100 |
| Lightness | 93/100 | 52/100 |
| Maps | 0/100 | 0/100 |
| Multi-band GPS | 0/100 | 67/100 |
| Display & extras | 50/100 | 50/100 |
GPS: 120 h = 100 · Weight: 35 g = 100, 95 g = 0 · Multi-band: by its battery (60 h = 100) · Display: AMOLED + music.
Spec-by-spec comparison
| Spec | Garmin Forerunner 165 | Suunto 9 Peak Pro |
|---|---|---|
| GPS battery | 19 h | 40 h |
| Multi-band battery | – | 40 h |
| Smartwatch | 11 days | 8 days |
| Weight | 39 g | 64 g |
| Maps | – | – |
| Multi-band | – | ✓ |
| Music | – | – |
| Display | AMOLED | AMOLED |
| Price | Entry | High-end |
| Where to buy | View on Amazon(opens in a new tab) | View on Amazon(opens in a new tab) |
GPS battery = each manufacturer's standard GPS mode; multi-band = dual-frequency (maximum accuracy). On Suunto, Polar Grit and Amazfit T-Rex the GPS figure already corresponds to dual-band mode. Figures verified against the manufacturer.
GarminGarmin Forerunner 165Entry-level running watch with a 1.2" AMOLED display, 19 h GPS battery and just 39 g. Training metrics, adaptive plans and accurate multi-GNSS GPS for training and racing marathons. Garmin's gateway watch for runners who don't need maps or multi-band.
View on Amazon(opens in a new tab)SuuntoSuunto 9 Peak ProTitanium mountain watch with AMOLED display, multi-band GPS and sapphire glass. Up to 40 h in multi-band GPS mode and 300 h in tour mode, at just 64 g. Suunto's high end without the size and extreme battery of the Vertical, for those who prioritise lightness and premium finishes.
View on Amazon(opens in a new tab)Will it last your race? Real battery across 300 races
We estimated a mid-pack runner's finish time for every race in our calendar (distance, elevation and terrain) and added a 25% safety margin. Here's the result:
Garmin Forerunner 165 lasts 224 of 300 races
Suunto 9 Peak Pro lasts 278 of 300 races
We couldn't find that race in our calendar. Try another name or the town.
| Race | Battery needed | Garmin Forerunner 165 | Suunto 9 Peak Pro |
|---|---|---|---|
| Kangas Mountain58 km · 3500 m+ | 19 h | Lasts | Lasts |
| Ultra Trail Torla-Ordesa50 km · 4100 m+ | 19 h | Lasts | Lasts |
| Ultra Trail Gredos71 km · 2322 m+ | 20 h | Dies | Lasts |
| Allgäu Panorama Marathon69 km · 3200 m+ | 22 h | Dies | Lasts |
| XtremeLagos42 km · 6000 m+ | 26 h | Dies | Lasts |
| Travesera Picos de Europa72 km · 5800 m+ | 29 h | Dies | Lasts |
| Costa Brava Stage Run125 km · 4820 m+ | 35 h | Dies | Lasts |
| Trail du Saint-Jacques by UTMB139 km · 6000 m+ | 41 h | Dies | Dies |
Estimate for a mid-pack runner on the longest distance, standard GPS on ultras and multi-band on races under 12 h. Tap a race to see the watches we recommend for it.
Verdict
For maximum autonomy on long ultras, Suunto 9 Peak Pro lasts longer in GPS mode. If you want the lightest watch on your wrist, go for Garmin Forerunner 165. On budget, Garmin Forerunner 165 is the more affordable option.
Analysis: where they really differ
They don't compete on price, but they do in the heads of many runners moving from road to mountains. The Forerunner 165 is Garmin's entry watch: 39 g, AMOLED, 19 h GPS and no multi-band. The Suunto 9 Peak Pro plays in a different league for the mountains: multi-band GPS with 40 h, sapphire and titanium. The key question is race length: with 19 h the Forerunner falls short in any ultra over ~60 km with climbing, while the Suunto covers most one-day ultras.
Choose the Garmin Forerunner 165 if…
- You mostly race up to mountain-marathon distance and train on plans
- You want the lightest, cheapest watch in the Garmin Connect ecosystem
- You don't need multi-band: you run on open trails
Choose the Suunto 9 Peak Pro if…
- You're moving up to ultras and need 40 h of battery
- You run in deep valleys or dense forest where multi-band accuracy matters
- You want a rugged watch (sapphire, titanium) built for years of mountain use