Garmin 745 Vs 255 | One Saves Cash, One Nails Training

This vs That / By

For tri‑ready GPS watches, choose Forerunner 255 for value and battery; pick Forerunner 745 if you want music built in and a smaller fit.

Running and triathlon watches steer training weeks, race prep, and daily wear. Garmin’s mid‑range duo covers the same jobs with different strengths. You’ll get the quick verdict, the spec gaps that matter, and clear buying paths so you can pick the watch that fits your runs, races, and budget.

In A Nutshell

The Forerunner 255 is the value pick. It lasts longer on a charge, adds dual‑frequency GPS for tough signal areas, and keeps the entry price low. The Forerunner 745 is the smaller tri watch with music and Wi‑Fi built in on every unit. If you want max battery and the newest tracking features, the 255 line wins for most buyers.

Side‑By‑Side Specs

Feature Garmin Forerunner 745 Garmin Forerunner 255
Cost $499.99 MSRP $349.99 base / $399.99 Music MSRP
Smartwatch Battery Up to 1 week Up to 14 days
GPS Battery (No Music) Up to 16 hr; UltraTrac up to 23 hr Up to 30 hr (GPS only)
Dual‑Frequency GNSS Not listed for 745 Yes (All Systems + Multi‑Band mode)
Music Storage Up to ~500 songs (on device) 4 GB (~500 songs) on Music model; none on base
Garmin Pay Yes (built in) Yes (all variants)
Wi‑Fi Yes Music models only
Triathlon Activity Yes Yes (Triathlon mode & multisport)

Garmin Forerunner 745 — What We Like / What We Don’t Like

✅ What We Like

  • Music and Wi‑Fi on every unit with room for ~500 songs.
  • Compact case that wears light during speed work.
  • Full swim‑bike‑run feature set with Garmin Pay on the wrist.

⚠️ What We Don’t Like

  • Shorter battery ratings than the newer model.
  • No dual‑frequency GNSS mode for tricky downtown routes.
  • MSRP launched higher, so deals need to be strong to compete.

Garmin Forerunner 255 — What We Like / What We Don’t Like

✅ What We Like

  • Longest battery of the pair in both smartwatch and GPS modes.
  • Dual‑frequency GNSS for better track logs near tall buildings or tree cover.
  • Two sizes (41 mm 255S and 46 mm) to fit more wrists.

⚠️ What We Don’t Like

  • Music and Wi‑Fi require the Music edition; base model skips both.
  • No built‑in topo maps (breadcrumb navigation only, same as 745).
  • Retailers sometimes stock only one size, so size choice can hinge on availability.

Forerunner 745 Or 255: Which Fits You Better

Performance & Speed

Both watches feel snappy for daily use: button presses respond quickly, screens flip through workouts and glances without lag, and course navigation keeps up with turns. The edge comes from the 255’s dual‑frequency GNSS option. When you run in a canyon of buildings or under dense trees, the “All Systems + Multi‑Band” mode can lock tracks that look cleaner on post‑run maps. The 745 can still record solid tracks, just without that extra L5 signal layer.

Display & Build

Both use a sunlight‑friendly memory‑in‑pixel display with always‑on visibility. The 745 wears smaller, which some runners prefer for track repeats and daily wear. The 255 line brings a second size, the 255S, which is the most wrist‑friendly of the bunch. Each model carries a 5 ATM water rating for pool and open‑water training.

Battery & Charging

If you want longer gaps between charges, the 255 wins. It’s rated for up to 14 days in smartwatch mode and up to 30 hours of GPS recording. The 745 lists up to one week in smartwatch mode and up to 16 hours of GPS tracking, or up to 6 hours with GPS + music. Numbers vary with settings, sensors, and screen backlight, but the spread is clear from Garmin’s own tables.

Garmin’s manuals spell out how satellite modes affect battery draw, including the multi‑band option on the 255. It’s worth setting GPS to a lighter mode for easy runs, then switching to multi‑band for race routes in dense downtowns. See Garmin’s “Battery Life Information” page for the full matrix and the 745’s “Forerunner Specifications” for its battery lines.

ℹ️ Good To Know: On the 255 line, Wi‑Fi lives on the Music models; the base model skips Wi‑Fi along with onboard audio. That’s normal and documented in Garmin’s manual.

Cameras & Sensors

There’s no camera, but the sensor suites matter. Both watches track wrist heart rate, SpO2 (pulse ox), and advanced training metrics. The 745 lists Training Status, Training Load, and recovery guidance in its manual. The 255 adds HRV Status in Garmin’s docs, and many buyers use that morning trend to pace easy and hard days. The 255 also supports multi‑band satellite reception, which is part of why its GPS tracks can look tidier in signal‑challenged spots.

Software & Updates

Both sync with Garmin Connect for plans, workouts, and community features. Daily Suggested Workouts, PacePro, racing tools, and multisport controls are present across the pair. The 255 adds features that arrived later in the Forerunner family, like HRV Status and a refreshed look to morning readouts. Each watch supports tri transitions and multisport history to review swim‑bike‑run segments and T1/T2 timing.

Ports & Connectivity

Bluetooth and ANT+ cover headphones and sensors on both models. The 745 includes Wi‑Fi across the board for auto‑upload and audio sync. On the 255, Wi‑Fi appears only on the Music version; the base model depends on phone sync over Bluetooth. Garmin Pay works on both, once you add a supported card in the app.

Pricing & Packages

Launch pricing set the tone. The 745 came to market at $499.99 USD. The 255 arrived at $349.99 for the base unit and $399.99 for the Music edition. Street prices move during U.S. sale events: the 255 Music has dropped near $220, and the base 255 around $250 on major deal days. The 745 has seen sizable dips as well, often landing in the mid‑$200s during sales.

Price, Value & Ownership

Factor Garmin Forerunner 745 Garmin Forerunner 255
Street Prices We See Often (U.S.) $240–$300 depending on sales $220–$300 depending on sales
Music & Wi‑Fi Included on all units Music edition adds both; base skips both
Triathlon Tools Swim‑bike‑run profiles + transitions Triathlon profile + Auto Sport Change
GNSS Options GPS/UltraTrac—no multi‑band listing All Systems + Multi‑Band mode available

Those gaps shape daily life with the watch. If you never run alone without a phone, the base 255 is a bargain because you skip music and still get stronger battery life and dual‑frequency accuracy. If untethered audio is a must on every run, the 745 gives it to you at the “all units” level without needing a music‑specific variant.

Where Each One Wins

Where Each One Wins:
🏆 Battery Life — Forerunner 255
🏆 Music Built‑In — Forerunner 745
🏆 Multi‑Band GPS — Forerunner 255
🏆 Wi‑Fi On Base Model — Forerunner 745
🏆 Small‑Wrist Option — Forerunner 255 (S)

Decision Guide

✅ Choose Garmin Forerunner 745 If…

  • You want music and Wi‑Fi without choosing a special edition.
  • You prefer a smaller case and keep your runs short to mid‑length.
  • You want a proven tri toolset with Garmin Pay on every unit.

✅ Choose Garmin Forerunner 255 If…

  • You want the best battery and cleaner tracks in tough GPS areas.
  • You plan to carry a phone for music or will step up to the Music model.
  • You want two size choices to get a snug, race‑ready fit.

Best Fit For Most Runners

Most buyers should start with the Forerunner 255. It stretches your dollars, extends battery life, and brings dual‑frequency GNSS that shines in cities and forests. Add the Music edition if you run without a phone. Pick the 745 when you want music and Wi‑Fi standard in a smaller case and your runs rarely push battery limits. Either way, you’re getting a capable tri‑ready watch with clean training tools and contactless pay.

Sources for specs and runtimes: Garmin’s Battery Life Information and the 745’s Forerunner Specifications.