Garmin Forerunner 255 GPS Running Smartwatch
More training data, longer battery, and deeper insights for the athlete who trains to improve.
- Daily suggested workouts adapt to your training load and recovery state
- Race predictor estimates finish times for 5K through marathon based on fitness
- Multi-band GPS improves accuracy in cities, forests, and canyon environments
- 14-day battery life in smartwatch mode versus 11 days on the FR165
Best For / Not For
Best for
- Dedicated runners who want structured training plan support from their watch
- Triathletes or multi-sport athletes who need transitions and sport-specific tracking
- Buyers who want race-day performance estimates from ongoing training data
Not for
- Casual fitness trackers who won't use training plan features
- Buyers who don't care about GPS precision in urban environments
- Anyone who finds the FR165 too expensive -- this costs more
Key Details
Daily Suggested Workouts
This is the defining feature of the 255 over the 165. The watch analyzes your training history and recovery status and suggests the day's workout -- easy run, tempo, intervals, or rest. It removes the decision fatigue of training planning and adapts dynamically to how your body is responding.
Multi-Band GPS
Standard GPS struggles in urban canyons, dense forest, and areas with signal interference. Multi-band GPS uses multiple satellite frequencies simultaneously to maintain lock in these environments. For runners and cyclists in cities or technical trail terrain, the difference in track accuracy is visible.
FR255 vs. FR165 -- Which One
The FR165 has AMOLED and is better looking on the wrist. The FR255 has more advanced training features and longer battery. If you follow a structured training plan and race regularly, the 255 is worth the extra cost. If you run casually or want a better everyday display, the 165 wins.
Pros and Cons
Pros
- Daily suggested workouts remove the guesswork from training planning
- Race predictor motivates and helps set realistic goals
- Multi-band GPS handles signal-challenged environments better
- Longer battery life for ultra-distance events and travel
Cons
- Higher price than the FR165 without an AMOLED display (uses MIP)
- Overkill for casual runners who won't use the advanced features
- Thicker and heavier than fashion smartwatches
Bottom Line
Buy the Garmin Forerunner 255 if you train with purpose and want the watch to actively support your plan. Daily suggested workouts, race predictor, and multi-band GPS make it worth the premium over the FR165 for serious athletes.
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