Garmin Forerunner 55 vs 245 vs 255 – The Key Differences

While Forerunner 55 succeeds Forerunner 45, Forerunner 255 succeeds Forerunner 245. The newer watches come with more features than their respective predecessors. The Forerunner 55 is a lower-end smartwatch, it has fewer features compared to the 245 and 255. However, it’s a decent GPS smartwatch with a great deal of activity tracking features and an outstanding 2 weeks battery life.

In other words, the Forerunner 55 is a cheaper alternative to the Forerunner 245 and 255. Hence this comparison is targeted at individuals trying to decide between the Garmin Forerunner 55 vs 245 vs 255. We discuss the differences to help you make a more informed decision.

Note that both the Forerunner 245 and 255 come in two models, the Music and non-Music edition. The music edition comes with about 4GB storage capacity and after system requirements, you are left with 3GB storage space which allows you to add over 300 tracks to the watch which you can listen to offline by connecting a Bluetooth headphone to the watch. You can add your personal music through the Garmin Connect app or via the Garmin express app on your computer. You can also add music via popular streaming services such as Amazon Music, Spotify and Deezer (these services may require a subscription).

The Forerunner 55 is only available in the non-music edition, there is no music edition.

Moreover, unlike the Forerunner 55 and 245, the Forerunner 255 comes in two sizes; Forerunner 255s (41mm) and Forerunner 255 (46mm). Both sizes have the same features and prices, however, differ in sizes, available colors, and battery life.

Garmin Forerunner 55 vs 245 vs 255 Full Specifications

Product Info	Garmin Forerunner 55 Specifications - Features - Pros - Cons and Prices Check Price	Garmin Forerunner 245 Specifications, Features and Price Check Price	Garmin Forerunner 255 Full Specifications, Features and Price Check Price
Price	$163.19	$299.99 $249.50	$314.99
ABOUT DEVICE	ABOUT DEVICE	ABOUT DEVICE	ABOUT DEVICE
Device name	Garmin Forerunner 55	Garmin Forerunner 245	Garmin Forerunner 255
Device type	Fitness/Sport smartwatch	Fitness/Sport smartwatch	Fitness/Sport smartwatch
Gender	Unisex	Unisex	Unisex
Release date	June, 2021	April, 2019	June, 2022
Predecessor	Garmin Forerunner 45	Garmin Forerunner 235	Garmin Forerunner 245
Successor	—	Garmin Forerunner 255	—
Versions	—	Garmin Forerunner 245, Garmin Forerunner 245 Music	Garmin Forerunner 255, Garmin Forerunner 255 Music
BODY	BODY	BODY	BODY
Dimension	42 x 42 x 11.6 mm	42.3 x 42.3 x 12.2 mm	45.6 x 45.6 x 12.9 mm
Weight	37 grams	38.5 grams	49 grams
Shape	Circular	Circular	Circular
Case material	Fiber-reinforced polymer	Fiber-reinforced polymer	Fiber-reinforced polymer
Strap material	Silicone	Silicone	Silicone
Bezel material	Fiber-reinforced polymer	Fiber-reinforced polymer	Fiber-reinforced polymer
Strap size	20 mm	20 mm	22 mm
Interchangeable strap	20mm, Yes	20mm, Yes	22 mm, Yes
Screen protection	Chemically strengthened glass	Corning Gorilla Glass 3	Corning Gorilla Glass 3
Water resistance	Yes, 5ATM	Yes, 5ATM	Yes, 5ATM
Durability test	—	—	—
Swim-proof	Yes, recommended	Yes, recommended	Yes, recommended
Color	Black, White	Berry, Gray	Black, Tidal blue
DISPLAY	DISPLAY	DISPLAY	DISPLAY
Display size	1.04 inches	1.2 inches	1.3 inches
Display type	LCD, Memory-in-pixel (MIP), transflective	LCD, Memory-in-pixel (MIP), transflective	LCD, Memory-in-pixel (MIP), transflective
Display resolution	208 x 208 pixels	240 x 240 px	260 x 260 px
Pixel density	282.8 PPI	282.8 PPI	282.8 PPI
Always on	Yes	Yes	Yes
Custom watch face	Yes	Yes	Yes
Input type	(not touchscreen), 5 Physical buttons	(not touchscreen), 5 Physical buttons	(not touchscreen), 5 Physical buttons
CONNECTIVITY	CONNECTIVITY	CONNECTIVITY	CONNECTIVITY
Bluetooth	ANT+, Bluetooth	ANT+, Bluetooth	ANT+, Bluetooth
Bluetooth calling	No	No	No
GPS	Galileo, GLONASS, GPS	Galileo, GLONASS, GPS	Galileo, GLONASS, GPS
NFC	No	No	Yes
Wi-Fi	No	Yes	Yes
MEMORY	MEMORY	MEMORY	MEMORY
RAM	N/A	—	—
ROM	N/A	—	—
Memory card slot	No	No	No
CELLULAR CONNECTIVITY	CELLULAR CONNECTIVITY	CELLULAR CONNECTIVITY	CELLULAR CONNECTIVITY
Technology	None	None	None
SIM type	None	None	None
Band	—	—	—
NOTIFICATIONS	NOTIFICATIONS	NOTIFICATIONS	NOTIFICATIONS
SMS alert	Yes	Yes	Yes
Calls alert	Yes	Yes	Yes
Email alert	Yes	Yes	Yes
Event reminder	Yes	Yes	Yes
Third-party apps alert	Yes	Yes	Yes
Reply to Notifications	-	-	-
MEDIA	MEDIA	MEDIA	MEDIA
Audio	No	No	mp3/mp4
Bluetooth music	No	No	No
Loudspeaker	No	No	No
Microphone	No	No	No
Camera	No	No	No
Radio	No	No	No
SENSORS	SENSORS	SENSORS	SENSORS
Sensor(s)	—	—	Multi-band GPS sensor
ACTIVITY TRACKING	ACTIVITY TRACKING	ACTIVITY TRACKING	ACTIVITY TRACKING
Blood oxygen	No	Yes	Yes
Blood Pressure	No	No	No
Calories	Yes	Yes	Yes
Distance	Yes	Yes	Yes
ECG tracking	No	No	No
Heart rate monitoring	Yes	Yes	Yes
Sleep tracking	Yes	Yes	Yes
Steps	Yes	Yes	Yes
Floors climbed	No	No	Yes
Stress	Yes	Yes	Yes
Fall detection	Yes	Yes	Yes
Menstrual cycle	Yes	Yes	Yes
VO2 Max	Yes	Yes	Yes
Swim-tracking	Yes	Yes	Yes
Underwater heart rate tracking	Yes	Yes	Yes
On-screen workout	No	No	Yes
Sport modes	Yes	Yes	Yes
BATTERY	BATTERY	BATTERY	BATTERY
Battery type	non-removable Lithium-polymer	non-removable Lithium-polymer	non-removable Lithium-polymer
Battery capacity	—	—	—
Battery life	GPS mode: Up to 20 hours, Smartwatch mode: Up to 2 weeks	GPS mode: 24hrs, Smartwatch mode: 7 days	GPS mode: Up to 30 hrs, Smartwatch mode: up to 14 days
Charging type	Charging dock	Charging dock	Charging dock
Charging time	1-2 hours	1-2 hours	1-2 hours
Solar charging	No	No	No
PLATFORM	PLATFORM	PLATFORM	PLATFORM
Chipset	N/A	—	—
CPU	N/A	—	—
GPU	N/A	—	—
Operating system	Proprietary OS	Proprietary OS	Proprietary OS
MISC	MISC	MISC	MISC
Companion app	Garmin Connect	Garmin Connect	Garmin Connect
Compatibility	Android 6.0+, iOS 13.0+	Android, iOS	Android 7.0+, iOS 14.0+
Payment system	None	None	Garmin Pay
Voice command	No	No	No
Find my phone	Yes	Yes	Yes
Box content	Charger, Garmin Forerunner 55, Manual, Straps	Charger, Garmin Forerunner 245, Manual, Straps	Charger, Garmin Forerunner 255, Manual, Straps

Forerunner 245 vs 255 – What’s New?

The Forerunner 255 is more equipped than the Forerunner 245, it welcomes new sensors which include a gyroscope, altimeter, and multi-band GPS sensors. It also has a longer battery life and more activity tracking features like the onscreen animated workout, animated muscle heat map, health snapshot, more workout profiles, and more.

1. Unlike Forerunner 245, the Forerunner 255 comes in two sizes of 41mm and 46mm which gives consumers the option to choose their preferred choice.
2. Garmin has added an NFC chip to the Forerunner 255. This enables Garmin Pay – a non-contactless payment system that will allow you to make payments directly from the watch.
3. Garmin has also equipped the Forerunner 255 with an altimeter that enables it to count floors climbed plus the ability to track elevation.
4. Multi-band GPS positioning that improves location tracking accuracy has also been added to the Forerunner 255. This was introduced to the Fenix 7 series.
5. The Forerunner 255 features onscreen animated workouts that can guide you through some of your favorite workouts. It also features the onscreen animated muscle heat map that shows which muscle is being worked during a workout.
6. The Connect IQ store app is now onboard the Forerunner 255, this allows for effortless management of apps and watch faces
7. The health snapshot feature that allows you to record a 2-minutes health related metrics is also available on the Forerunner 255. Metrics recorded include heart rate, heart rate variability (HRV), Pulse Ox, respiration, and stress.
8. The Forerunner 255 features more gym profiles with pilates, floor climbing, and HIIT added. It also features corresponding workouts for these profiles.
9. The Forerunner 255 welcomes more training and planning features such as improved intervals, rest timer, auto and manual multisport activities and training load focus. Thus, the Forerunner 255 unlike its predecessor is a triathlon/multisport smartwatch.
10. The Forerunner 255 has got new heart rate tracking features. It will now give you a morning report that contains a summary of important details such as HRV, intensity minutes, weather report, body battery energy and more.
11. New running features such as course and weather-specific race predictor and running power have been added to the Forerunner 255. Ultra running profile has also been added.
12. The Forerunner 255 gets new outdoor recreational profiles which include hiking, skiing, snowboarding, XC classic skiing, stand up paddleboarding, and rowing.

    Other outdoor features such as Up ahead, elevation profile, barometric trend indicator, and vertical speed have also been added.

13. The Forerunner 255 welcomes more running profiles such as mountain biking, eBiking and eMountain biking.
14. Support for open water swimming has been added to the Forerunner 255. Thus, it will track open water metrics such as distance, pace, stroke rate, stroke distance, swim efficiency (SWOLF) and calories.
15. Finally, the Forerunner 255 has twice the battery life of its predecessor. It has up to 14 days of battery life compared to about 7 days with the Forerunner 245. Meanwhile, it’s up to 12 days with the smaller Forerunner 255s edition.

Forerunner 55 vs 245 vs 255 – The Differences

As we mentioned earlier, the Forerunner 55 is a lower-end smartwatch compared to the 245 and 255. However, it shares a lot of similarities with these other two. All three watches have the same fiber-polymer case paired with silicone straps. The display type is also the same, and all three watches have 5 physical buttons for navigation.

In terms of activity tracking, each of these three is able to track your sleep, heart rate, calories, stress, steps and a lot more. All three watches are equipped with an inbuilt GPS that enables outdoor activity tracking for your pace, locations, and routes. And when you have your phone with you, each of these three can detect a hard fall that will activate Assistance, a feature that automatically sends a message containing your name and location to a preset emergency contact.

Similarly, when you phone is nearby, you will be able to get message alerts on any of these watches. You need to enable notifications from the Garmin Connect app to get message alerts from apps installed on your phone.

You can clearly see that each of these three is sturdily built, has an easy to read display, a long list of activity tracking features, and long battery life.

So let’s take a look at the differences between the Forerunner 55, 245, and 255.

1. All three watches are very compact and lightweight, although, the Forerunner 55 weighs a little less than the 245 and 255.
2. The Forerunner 55 with a 1.04 inches display has the smallest display size compared to the 1.2 inches of Forerunner 245 and 255s. The bigger Forerunner 255 (46mm) has a 1.3 inches display size.
3. The Forerunner 55 lacks onboard music storage, meanwhile, the Forerunner 245 and 255 music editions will allow you to add music to the watch for offline listening.
4. While you can reply to messages with preset replies on the Forerunner 245 and 255, message alerts on the Forerunner 55 is read-only, you can’t reply. Note that the reply function is only supported for Android smartphones.
5. The Forerunner 55 lacks the ability to measure your blood oxygen which is available on both Forerunner 245 and 255.
6. Apart from the features new to the Forerunner 255 as listed above that are not available on Forerunner 245 and 55, the Forerunner 55 also has fewer gym profiles, fewer cycling features, fewer running features, and fewer outdoor recreational features.
7. Meanwhile, while you get up to 7 days of battery life with the Forerunner 245, the Forerunner 55 and 255 have up to 2 weeks of battery life. The Forerunner 255s has about 12 days of battery life.

Forerunner 55, 245 or 255 – Which Should You Buy?

From all indications and experiences, each of these three is an outstanding GPS smartwatch that’s durable, well-equipped to track your daily activities, and has a long battery life.

However, going by available features, the Forerunner 255 offers the most features. It’s a more comprehensive activity tracker than the Forerunner 245 and even more comprehensive than the Forerunner 55. It’s available in two sizes which gives you the option to choose your preferred choice. It can count floors and has a multi-band GPS sensor that enables improved location and route tracking accuracy. Moreover, it welcomes most of the new activity tracking features that are available on recently released Garmin smartwatches.

A cheaper alternative to the Forerunner 255, will be the Forerunner 245. It has lots of features in common to the 255, but less equipped.

And if you’re very low on budget, the Forerunner 55 is a great choice. It has an outstanding long battery life and also well equipped to track your daily activities.

Garmin Forerunner 255 List of All Activity Tracking Features

Health Monitoring Features

1. 24/7 heart rate monitoring
2. Resting heart rate
3. Abnormal heart rate (high and low)
4. Respiratory rate
5. Blood oxygen measurement
6. Fitness age (shows your fitness status)
7. Battery energy monitor (gives you insight into your fitness level to help you know the best time to train)
8. Stress monitoring
9. Relaxation reminder
10. Relaxation breathing reminder
11. Sleep tracking
12. Sleep score insights
13. Hydration tracking
14. Menstrual cycle tracking for women
15. Health snapshot

Safety and Tracking Features

1. LiveTrack

Allows your family and friends to follow your outdoor workout activities in real time.

2. Live event sharing

Allows you to send real-time updates on your outdoor training activity to family and friends.

3. Incidental fall detection

Will enable the watch to detect a hard fall. When a hard fall is detected and your phone is nearby, the watch will activate Assistance.

4. Assistance

When Assistance is activated, the watch will automatically send a message with your name and current location to a preset emergency contact (phone must be nearby).

Activity Tracking Features

1. Steps counter
2. Move bar (Displays on device after a period of inactivity; walk for a couple of minutes to reset it)
3. Auto goal (Learns your activity level and assigns a daily step goal)
4. Calories burnt
5. Floors climbed
6. Distance travelled
7. TrueUp
8. Move IQ
9. Garmin Connect Challenges app (optional Connect IQ app)

Gym and Fitness Equipment

1. Automatic rep counting
2. Available gym profiles (Strength, HIIT, cardio and elliptical training, stair stepping, floor climbing, indoor rowing, pilates and yoga)
3. Strength workout
4. HIIT workouts
5. Yoga workouts
6. Pilates workouts
7. Onscreen workout animations
8. Onscreen workout muscle maps

Heart Rate Tracking Features

1. HR zones
2. HR alerts
3. HR calories
4. % HR max
5. %HRR
6. Recovery time (measures how well you’ve recovered from previous training)
7. Auto Max HR
8. Morning report New
9. Race glance/widget New
10. HRV status New
11. HR Broadcast (broadcasts HR data over ant+™ to paired devices)
12. Respiratory rate during exercise (with compatible accessory)

Training, Planning, and Analysis Features

1. GPS speed and distance
2. Customizable data pages
3. Customizable activity profiles
4. Auto pause
5. Interval training
6. Improved interval (Includes open repeats, intervals data page, rest screen and auto detection) New
7. Advanced workouts
8. Downloadable training plans
9. Auto lap
10. Manual lap
11. Rest timer
12. Configurable lap alerts
13. VO2 Max. (run)
14. VO2 Max. (trail run)
15. Training status (improved)
16. Training load
17. Training load focus
18. Training effect (aerobic)
19. Training effect (anaerobic)
20. Primary benefit (Training effect labels)
21. Improved recovery time
22. Daily suggested workouts (for 7 days)
23. Custom alerts
24. Audio prompts
25. Finish time
26. Virtual partner
27. Race an activity
28. Auto multisport activities
29. Manual multisport activities
30. Course guidance
31. Touch and/or button lock
32. Auto scroll
33. Activity history on watch
34. Physio trueUp

Running Features

1. Available run profiles include running, outdoor track running, treadmill running, indoor track running, trail running, virtual running, and ultra running.
2. GPS-based distance, pace and time
3. Running dynamics (with compatible accessory)
4. Vertical oscillation and ratio (with compatible accessory)
5. Ground contact time and balance (with compatible accessory)
6. Real-time stride length (with compatible accessory)
7. Cadence
8. Running power (with compatible accessory) (improved)
9. Performance condition
10. Lactate threshold (with compatible accessory)
11. PacePro
12. Run workouts
13. Trail run auto climb
14. Race predictor
15. Course and weather-specific race predictor
16. Foot pod capable

Outdoor Recreational Features

1. Available outdoor recreational profiles include hiking, skiing, snowboarding, xc classic skiing, stand up paddleboarding, and rowing.
2. Point-to-point navigation
3. Breadcrumb trail in real-time
4. Back to start
5. Tracback
6. Ultra mode
7. Up ahead
8. Elevation profile
9. Distance to destination
10. Barometric trend indicator with storm alert
11. Vertical speed
12. Total ascent/decent
13. Feature elevation plot
14. Projected waypoint
15. Sun and moon information

Cycling Features

1. Available cycling profiles include Biking, mountain biking, ebiking, and emountain biking.
2. Courses
3. MTB Grit and Flow
4. Bike lap and lap maximum power (with power sensor
5. Race an activity
6. Functional threshold power (with compatible accessory)
7. Compatible with vector and rally power meters
8. Power meter compatible
9. Compatible with Varia Vision (head-mounted display)
10. Compatible with Varia radar (rear-facing radar)
11. Compatible with Varia lights
12. Speed and cadence sensor support (w/sensor)

Swim Tracking Features

1. Available swim profiles include pool swimming and open water swimming.
2. Open-water swim metrics include distance, pace, stroke count/rate, stroke distance, swim efficiency (SWOLF) and calories
3. Pool swim metrics include lengths, distance, pace, stroke count, swim efficiency (swolf) and calories
4. Stroke type detection includes freestyle, backstroke, breaststroke, and butterfly (pool swim only)
5. Drill logging (pool swim only)
6. Basic rest timer (up from 0) (pool swim only)
7. Repeat on rest timer (pool swim only)
8. Auto rest (pool swim only)
9. Time and distance alerts
10. Pacing alerts (pool swim only)
11. Countdown start (pool swim only)
12. Pool swim workouts
13. Critical swim speed
14. Underwater heart rate tracking
15. Heart rate from external HRM (real-time during rests, interval and session stats during rests, and automatic heart rate download post-swim)