For Garmin’s midrange run watches, choose Forerunner 255 for multi‑band GPS and tri modes; pick Forerunner 55 for a simple, lower‑cost tracker.
Garmin Forerunner 255
Garmin Forerunner 55
Budget Start
- All‑day basics + accurate GPS
- PacePro & Track Run tools
- Light, easy to live with
Forerunner 55
Balanced Training
- Multi‑band GNSS & tri mode
- Garmin Pay + optional music
- HRV & training status
Forerunner 255 / 255 Music
Running watches steer training, pacing, sleep habits, and even how you pay post‑run. Garmin’s midrange duo takes different routes to the same finish: one leans into accuracy and race‑day features, the other keeps cost and complexity low. This guide gives you the fast verdict and the trade‑offs that matter.
In A Nutshell
The Forerunner 255 suits runners who want stronger GPS accuracy, triathlon tracking, and deeper training metrics without jumping to the top tier. The Forerunner 55 is the easy pick for new runners and budget‑first buyers who want trusted basics, light weight, and Garmin’s coaching tools. If you’ll ever do multisport or race in tricky GPS areas, the 255 pays back quickly. If you just want pace, distance, guidance, and comfort, the 55 nails it.
Side‑By‑Side Specs
ℹ️ Good To Know: The 255’s “All‑systems + Multi‑Band” GNSS mode improves track accuracy in cities and forests; expect shorter battery life than GPS‑only. The 55 offers GPS/GLONASS/Galileo without dual‑frequency, which still works well for most suburban runs. See Garmin’s battery mode details for the 255 and the 55 manuals for runtime guidance (255 battery modes · 55 manual).
Garmin Forerunner 255 — What We Like / What We Don’t Like
✅ What We Like
- Multi‑band GNSS improves accuracy around tall buildings and trees.
- Full triathlon profile with transitions for race day.
- Training status, HRV status, Morning Report, and deeper recovery cues.
- Optional Music + Wi‑Fi, plus Garmin Pay for quick coffee stops.
- 22 mm band size opens a wide strap selection.
⚠️ What We Don’t Like
- Higher price; music/Wi‑Fi require the Music edition.
- Dual‑band mode cuts battery life compared with GPS‑only.
- No bright AMOLED panel if you prefer smartwatch aesthetics.
Garmin Forerunner 55 — What We Like / What We Don’t Like
✅ What We Like
- Friendly price with long smartwatch battery life.
- PacePro and Track Run modes give race‑day structure without fuss.
- Light 37 g case feels invisible on daily runs.
- Daily suggested workouts keep training on track.
- Simple setup; fewer menus to tweak.
⚠️ What We Don’t Like
- No multisport/tri profile; race transitions not tracked.
- No Garmin Pay; no on‑watch music storage or Wi‑Fi.
- Single‑band GNSS can wander more in tough signal areas.
Forerunner 255 Or Forerunner 55: Which Fits You Better
Display & Build
Both use Garmin’s sunlight‑friendly MIP display, which favors battery life and outdoor readability. The 255 comes in two case sizes: 46 mm (~49 g) and 41 mm (~39 g). The 55 sits between them at 42 mm (~37 g). If you’re weight‑sensitive or have smaller wrists, the 55 or the 255S both wear slim. If you want a larger screen and buttons with more room, the 46 mm 255 feels steadier with gloves.
Band widths differ, which matters for replacements and comfort. The 255 uses 22 mm quick‑release straps; the 55 uses 20 mm quick‑release. Third‑party options are everywhere, and Garmin sells official quick‑release bands in both sizes.
Battery & Charging
The 55’s promise is simple: up to 2 weeks in smartwatch mode and up to 20 hours of GPS recording. The 255 stretches in multiple ways: up to 14 days as a smartwatch, up to 30 hours in GPS‑only, ~25 hours with all‑systems GNSS, and ~16 hours with multi‑band active (numbers vary slightly by size and Music edition). Those modes let you trade accuracy for runtime or vice‑versa. If you run urban canyons or tree tunnels, the 255’s multi‑band is a confidence boost; for park loops and suburban miles, the 55’s GPS runtime is ample. Source: Garmin owner’s manuals.
Cameras & Sensors
No cameras here, but sensors are the story. The 255 adds dual‑frequency GNSS (“All‑systems + Multi‑Band”), which reduces multipath errors and cleans up tracks in hard spots. It also pairs to a wider set of accessories: running power (with compatible HRM or pod), cycling speed/cadence, and power meters over ANT+ or Bluetooth. The 55 pairs to heart‑rate chest straps and basic bike sensors but skips power and the advanced run dynamics stack. If you want to see power targets on your wrist, the 255 is the path.
Software & Updates
Both watches share Garmin Coach, daily suggested workouts, and PacePro guidance. The 255 layers on HRV status, training status, a race widget, and a Morning Report that bundles sleep, HRV, and suggested sessions. That stack gives better context for building or backing off. The 55 keeps you on track with simpler cues: recovery time, suggested runs, and easy‑to‑follow targets. If you like more data without stepping into premium models, the 255 is a sweet spot.
Ports & Connectivity
Both support ANT+ and Bluetooth accessory pairing, plus Bluetooth phone sync. The 255 Music adds Wi‑Fi for faster uploads and for music transfers from Spotify, Amazon Music, or Deezer. The 55 has no Wi‑Fi and no on‑watch music. Garmin Pay is available on the 255 series, not on the 55. If you want to run phone‑free with playlists or tap‑to‑pay, the 255 Music edition is the one to get.
Pricing & Packages
Garmin’s list at launch in the US put the 55 at $199.99, the 255 at $349.99, and the 255 Music at $399.99. Street prices swing with promos; the 255 family often dips, especially when newer models arrive, while the 55 sees frequent discounts from its $199.99 list.
Price, Value & Ownership
Here’s the gap that matters: if you never need tri mode, running power, or dual‑band accuracy, the 55 saves real money. If you do, the 255’s features cost less than jumping to higher lines, and seasonal discounts often narrow the difference even more.
Where Each One Wins
🏆 Triathlon & Cycling Power — Forerunner 255
🏆 Price & Simplicity — Forerunner 55
🏆 Lightest Daily Wear — Forerunner 55
🏆 On‑Wrist Music & Pay — Forerunner 255
Decision Guide
✅ Choose Garmin Forerunner 255 If…
- You race near tall buildings or dense woods and want steadier tracks.
- You plan to do triathlon or brick sessions and want true multisport timing.
- You’ll pair accessories like power meters or a Running Dynamics Pod.
- You want Garmin Pay or phone‑free music on the Music edition.
✅ Choose Garmin Forerunner 55 If…
- You’re starting a structured plan and want an easy watch that just works.
- You value low weight and a smaller case for all‑day wear.
- You don’t need multisport timing, contactless pay, or on‑watch playlists.
Best Fit For Most Runners
If your runs stay on roads and trails with open sky and you want a lighter bill, the Forerunner 55 remains a smart starter pick. If your routes or goals push past that—city canyons, trail races, bricks, cycling with power—the Forerunner 255 is the better long‑term partner. Most buyers who can swing the price difference should start with the 255; everyone else gets excellent value from the 55.
Method: facts compiled from Garmin owner’s manuals and product pages; pricing refers to US list, with sale trends observed seasonally. Links: 255 battery & GNSS modes (owner’s manual), 55 owner’s manual for runtime; Garmin Pay/Wi‑Fi appear on the 255 family; band widths via Garmin quick‑release bands pages.