Garmin Bounce 2 vs Forerunner 170
Size, specs & wrist fit compared
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Which one fits you
Both need much the same wrist — roughly 45–61mm across the flat of the wrist. Neither will fit where the other won't, so decide on thickness, weight and features instead.
The Bounce 2 and Forerunner 170 share a near-identical 43mm case, so wrist presence comes down to thickness, lug-to-lug and weight.
The Forerunner 170 is the slimmer of the two (11.9mm vs 12.4mm), so it slides under a cuff more easily.
On the wrist the Bounce 2 feels lighter (26.5g vs 41g, case only).
The Bounce 2 is thinner than 75% of the 318 43mm watches we hold thickness for, the Forerunner 170 than 84% — so both wear flatter than their widths suggest.
The Bounce 2 is 0.4mm wider, 0.4mm longer, 0.5mm thicker and 14.5g lighter than the Forerunner 170. Both are circular.
Bounce 2
Forerunner 170
Switch or add watches
Garmin
Bounce 2
Garmin
Forerunner 170
Watch Fit Tool
For sports watches, lug-to-lug (L2L) is what matters most — it decides whether a watch overhangs your wrist. Bulky is fine; overhang is not.
Measure at the point where you wear your watch — typically just below the wrist bone.
Flat width — lay your arm on a table, palm facing up, and measure straight across the top of your wrist with a ruler. Bone to bone; do not follow the curve down the sides.
Around — wrap a tape measure snugly round the wrist. No tape? Wrap a strip of paper, mark the overlap and hold the strip against a ruler.
Width ≠ circumference. They are different numbers — around 170mm is about 64mm across — so set the toggle to whichever one you actually measured before you type it in.
Garmin Bounce 2
Case 43.0mm · Lug-to-lug 43.0mm · Thickness 12.4mm · 27g
Balanced Fit
43mm on a 55mm wrist
Comfortably inside the edges of your wrist, and it seats and sits low enough to wear without thinking about it.
On a 55mm wrist the sweet spot is 47–53mm lug to lug. This one is 43mm, so you could go bigger.
Measure where you wear it, just below the wrist bone. Either of these works — the tool converts between them.
- 1. Flat width — arm flat on a table, palm up. Measure straight across the top of the wrist, bone to bone, ignoring the curve down the sides.
- 2. Around — a tape, or a strip of paper marked and held against a ruler, snug the whole way round.
Leather: Attaches at the lugs, so the case back rests on your skin. Thins and softens with wear. Typical figures, not this model’s own.
Show the measurementsHide the measurements
- Across the wrist6.0mm spare each side
Comfortable, with visible skin either side.
- Off the wrist12.4mm off the skin
Normal sports-watch height for a wrist this size. (12.4mm case, back against the skin)
- How it seats~4.4mm under the rim
Seats well, with the case back following most of the wrist.
- Weight on the wrist27g
Light enough to forget you have it on. (0.5g per mm of wrist)
Garmin Forerunner 170
Case 42.6mm · Lug-to-lug 42.6mm · Thickness 11.9mm · 41g
Balanced Fit
42.6mm on a 55mm wrist
Comfortably inside the edges of your wrist, and it seats and sits low enough to wear without thinking about it.
On a 55mm wrist the sweet spot is 47–53mm lug to lug. This one is 42.6mm, so you could go bigger.
Measure where you wear it, just below the wrist bone. Either of these works — the tool converts between them.
- 1. Flat width — arm flat on a table, palm up. Measure straight across the top of the wrist, bone to bone, ignoring the curve down the sides.
- 2. Around — a tape, or a strip of paper marked and held against a ruler, snug the whole way round.
Leather: Attaches at the lugs, so the case back rests on your skin. Thins and softens with wear. Typical figures, not this model’s own.
Show the measurementsHide the measurements
- Across the wrist6.2mm spare each side
Comfortable, with visible skin either side.
- Off the wrist11.9mm off the skin
Normal sports-watch height for a wrist this size. (11.9mm case, back against the skin)
- How it seats~4.2mm under the rim
Seats well, with the case back following most of the wrist.
- Weight on the wrist41g
Light enough to forget you have it on. (0.7g per mm of wrist)
2D Dimension Schematics
Every case drawn to scale on a shared centre — from above, and in profile against the wrist.
- Garmin Bounce 243mm · 12.4mm thick
- Garmin Forerunner 17042.6mm · 11.9mm thick
3D preview
Bounce 2 vs Forerunner 170 on a wrist
Sized to your own wrist, turned any way you like.
Shapes are built from published measurements, not manufacturer 3D models — accurate proportions, generic dial.
Battery life compared
Furthest apart in Smartwatch mode, where the Forerunner 170 lasts 5.0× as long as the Bounce 2 (10 days against 2 days).
Bounce 2Forerunner 170
Smartwatch
2 days10 days
Specifications
The short version
7 key specs| Spec | GarminBounce 2 | GarminForerunner 170 |
|---|---|---|
| Case Width | 43mm | 42.6mm |
| Thickness | 12.4mm | 11.9mm |
| Weight | 26.5g | 41g |
| Shape | Circular | Circular |
| Display type | AMOLED | AMOLED (optional always-on mode) |
| Battery life | Up to 2 days See Details | Smartwatch mode: Up to 10 days (4 days display always-on) Battery Saver Smartwatch mode: Up to 19 days GPS-Only GNSS mode: Up to 20 hours All-Systems GNSS mode: Up to 14 hours See Details |
| Released | 2025 | 2026 |
Every specification
271 specs| Spec | Garmin Bounce 2 | Garmin Forerunner 170 |
|---|---|---|
| Overview | ||
| Family | Garmin | Garmin |
| General | ||
| Weight | 26.5 g (40.4 g with included band) | 41 g |
| Battery life | Up to 2 days See Details | Smartwatch mode: Up to 10 days (4 days display always-on) Battery Saver Smartwatch mode: Up to 19 days GPS-Only GNSS mode: Up to 20 hours All-Systems GNSS mode: Up to 14 hours See Details |
| Battery type | Lithium ion | Lithium ion |
| Display Size | 1.2" (30.4 mm) diagonal | 1.2" (30.4 mm) diameter |
| Case material | fiber-reinforced polymer | — |
| Color display | Yes | Yes |
| Lens material | chemically-strengthened glass | chemically strengthened glass |
| Physical size | 43 mm x 43 mm x 12.4 mm Band size: 115 mm to 180 mm | 42.6 x 42.6 x 11.9 mm Fits wrists with a circumference of 126-203 mm |
| Bezel material | fiber-reinforced polymer | fiber-reinforced polymer |
| Memory/History | 4 GB | 4 GB |
| Strap material | silicone | silicone |
| Charging method | Garmin proprietary plug charger | Garmin proprietary plug charger |
| Large font option | Yes | Yes |
| Display resolution | 390 x 390 pixels | 390 x 390 pixels |
| Built-in speaker/microphone | Yes | — |
| Quick Release bands | — | yes (20 mm, Industry standard) |
| Sensors | ||
| Calculator | Yes | Yes |
| Color shift | Yes | Yes |
| Connectivity | Bluetooth®, Wi-Fi®, LTE (with subscription) | Bluetooth®, ANT+® |
| Voice command | Yes | — |
| Weather forecasts | Yes | Yes |
| Smartphone compatibility | iPhone®, Android™ | iPhone®, Android™ |
| Find My Garmin (helps locate lost device) | Yes | Yes |
| Stocks | — | Yes |
| Calendar | — | Yes |
| Passcode | — | Yes |
| Garmin Share | — | Yes |
| Hourly alert | — | Yes |
| Color filters | — | Yes |
| Find My Phone | — | Yes |
| Evening report | — | Yes |
| Morning report | — | Yes |
| Red shift mode | — | Yes |
| Smart Notifications | — | Yes |
| Smart trainer control | — | Yes |
| Controls smartphone music | — | Yes |
| On-device Connect IQ™ Store | — | Yes |
| Find My Phone during GPS activity | — | Yes |
| Pairs with Garmin Connect™ Mobile | — | Yes |
| Compatible with Garmin Messenger app | — | Yes |
| Battery saver (customizable low power watch) | — | Yes |
| Realtime settings sync with Garmin Connect™ mobile | — | Yes |
| View images from notifications on watch (Android™ only) | — | Yes |
| Text response/reject phone call with text (Android™ only) | — | Yes |
| Connect IQ™ (downloadable watch faces, data fields and apps) | — | Yes |
| Variant | ||
| Color | Slate Gray | Black with Black/Amp Yellow Band |
| Available Colors | Turquoise; Light Purple; Slate Gray | Black with Black/Amp Yellow Band; Whitestone with Whitestone/Cloud Blue Band |
| Clock Features | ||
| GPS | Yes | — |
| QZSS | Yes | — |
| BeiDou | Yes | — |
| GLONASS | Yes | — |
| Galileo | Yes | — |
| Accelerometer | Yes | — |
| Ambient light sensor | Yes | — |
| Sleep | — | yes (advanced) |
| Hydration | — | yes (in Garmin Connect™ and optional Connect IQ™ widget) |
| Breathwork | — | Yes |
| Fitness age | — | Yes |
| Sleep coach | — | Yes |
| Health status | — | Yes |
| Nap detection | — | Yes |
| All-day stress | — | Yes |
| Women's health | — | yes (in Garmin Connect™ and optional Connect IQ™ widget) |
| Health snapshot | — | Yes |
| Respiration rate | — | Yes |
| Lifestyle logging | — | Yes |
| Resting heart rate | — | Yes |
| Breathing variations | — | Yes |
| Relaxation reminders | — | Yes |
| Abnormal heart rate alerts | — | yes (high and low) |
| Relaxation breathing timer | — | Yes |
| Body Battery™ energy monitor | — | Yes |
| Heart rate (constant, every second) | — | Yes |
| Cycling Features | ||
| Games | Yes | — |
| Chores | yes (with LTE subscription; coverage details) | — |
| Audible alerts | Yes | — |
| Sleep tracking | yes (movement-based) | — |
| Reminder alerts | Yes | — |
| Rewards (coins) | Yes | — |
| 60-minute activity goal | Yes | — |
| Do not disturb/School mode | Yes | — |
| Themes (colors and graphic choices) | Yes | — |
| Task timers (2, 5, 10, 15, 20 and 30 minutes) | yes (2, 5, 10, 20, 30 and custom) | — |
| Pool swim workouts | — | Yes |
| Time and distance alerts | — | Yes |
| Auto rest (pool swim only) | — | Yes |
| Drill logging (pool swim only) | — | Yes |
| Countdown start (pool swim only) | — | Yes |
| Underwater wrist-based heart rate | — | Yes |
| "Repeat on" rest timer (pool swim only) | — | Yes |
| Basic rest timer (up from 0) (pool swim only) | — | Yes |
| Stroke type detection (freestyle, backstroke, breaststroke, butterfly) (pool swim only) | — | Yes |
| Pool swim metrics (lengths, distance, pace, stroke count, swim efficiency (SWOLF), calories) | — | Yes |
| Open-water swim metrics (distance, pace, stroke count/rate, stroke distance, swim efficiency (SWOLF), calories) | — | Yes |
| Heart rate from external HRM (real-time during rests, interval and session stats during rests, and automatic heart rate download post-swim) | — | Yes |
| Running Features | ||
| Alerts (triggers alarm when you reach goals including time, distance, heart rate or calories) | yes (time and distance only) | — |
| Auto rest | — | Yes |
| UltraTrac mode | — | Yes |
| Vertical speed | — | Yes |
| Elevation profile | — | Yes |
| Total ascent/descent | — | Yes |
| Future elevation plot | — | Yes |
| Distance to destination | — | Yes |
| Sun and moon information | — | Yes |
| Rest Timer (Ultra Run only) | — | Yes |
| What You'll Love | ||
| Timer | Yes | Yes |
| Stopwatch | Yes | Yes |
| Time/date | Yes | Yes |
| Alarm clock | Yes | Yes |
| Touchscreen | Yes | Yes |
| Display type | AMOLED | AMOLED (optional always-on mode) |
| Water rating | 5 ATM | 5 ATM |
| GPS Time Sync | Yes | Yes |
| LTE communication | yes (plan required, coverage details) | — |
| Automatic daylight saving time | Yes | Yes |
| Battery life (smartwatch mode) | Up to 2 days | Up to 10 days |
| Garmin Pay™ | — | Yes |
| Training status | — | Yes |
| Smart wake alarm | — | Yes |
| Training readiness | — | Yes |
| Sunrise/sunset times | — | Yes |
| Pulse Ox blood oxygen | — | yes (spot-check, and optional all-day and in sleep) |
| Sleep score and insights | — | Yes |
| Activity Profiles | ||
| Assistance | yes (with LTE subscription; coverage details) | Yes |
| Location tracking | yes (with LTE subscription; coverage details) | — |
| Boundary enter/exit | yes (with LTE subscription; coverage details) | — |
| Live Event Sharing | — | Android™ Only |
| Incident Detection during select activities | — | Yes |
| Incident detection alert on phone for wearables | — | Yes |
| Daily Smart Features | ||
| LTE LiveTrack | yes (coverage details) | — |
| Text messaging | yes (coverage details) | — |
| Location check-ins | yes (LTE; coverage details) | — |
| LTE voice messaging | yes (including voice transcription; coverage details) | — |
| Two-way voice calls | yes (coverage details) | — |
| HIIT workouts | — | Yes |
| Yoga workouts | — | Yes |
| Cardio workouts | — | Yes |
| Pilates workouts | — | Yes |
| Strength workouts | — | Yes |
| Garmin Cycling Coach | — | Yes |
| Garmin Running Coach | — | Yes |
| Garmin fitness coach | — | Yes |
| Garmin Coach - Strength | — | Yes |
| Garmin Running Coach Experts | — | Yes |
| On-screen workout muscle maps | — | Yes |
| Garmin Coach - Prebuilt Cycling Plans | — | Yes |
| Daily Suggested Workout - Running (Pace and Heart Rate Based) | — | Yes |
| Activity Tracking Features | ||
| Manual lap | Yes | Yes |
| Custom alerts | yes (time and distance only) | Yes |
| Interval training | yes (customizable for time and distance) | Yes |
| GPS speed and distance | Yes | Yes |
| Configurable lap alerts | Yes | Yes |
| Auto Lap® interval tracking feature | Yes | Yes |
| % HRR | — | Yes |
| % HR max | — | Yes |
| HR zones | — | Yes |
| HR alerts | — | Yes |
| Shortcuts | — | Yes |
| HRV status | — | Yes |
| Load ratio | — | Yes |
| Rest timer | — | Yes |
| Auto max HR | — | Yes |
| Finish time | — | Yes |
| HR calories | — | Yes |
| Voice alerts | — | Yes |
| Physio TrueUp | — | Yes |
| Recovery time | — | Yes |
| Training load | — | Yes |
| VO2 Max (Run) | — | Yes |
| Course guidance | — | Yes |
| Training effect | — | Yes |
| Race an Activity | — | Yes |
| Advanced workouts | — | Yes |
| Race glance/widget | — | Yes |
| Training load focus | — | Yes |
| VO2 Max (Trail Run) | — | Yes |
| Customizable data pages | — | Yes |
| Unified training status | — | Yes |
| Touch and/or button lock | — | Yes |
| Activity history on watch | — | Yes |
| Downloadable training plans | — | Yes |
| Training effect (anaerobic) | — | Yes |
| HRM running pace and distance | — | Yes |
| Customizable activity profiles | — | Yes |
| Auto Pause® automatic timer halt | — | Yes |
| Respiration rate (during exercise) | — | yes (with compatible accessory) |
| Primary benefit (Training Effect labels) | — | Yes |
| HR broadcast (broadcasts HR data over ANT+® to paired devices) | — | Yes |
| Improved interval (includes open repeats, intervals data page, rest screen and auto detection) | — | Yes |
| Safety and Tracking Features | ||
| Step counter | Yes | Yes |
| TrueUp™ | — | Yes |
| Move IQ™ | — | Yes |
| Floors climbed | — | Yes |
| Calories burned | — | Yes |
| Distance traveled | — | Yes |
| Intensity minutes | — | Yes |
| Automatic rep counting | — | Yes |
| Move Alert movement options | — | Yes |
| Garmin Connect™ Challenges app | — | yes (optional Connect IQ app) |
| Move alerts (displays on device after a period of inactivity) | — | Yes |
| Auto goal (learns your activity level and assigns a daily step goal) | — | Yes |
| Training, Planning and Analysis Features | ||
| GPS-based distance, time and pace | Yes | Yes |
| Run workouts | — | Yes |
| Quick workout | — | Yes |
| Running power | — | Yes |
| Race predictor | — | Yes |
| Foot pod capable | — | Yes |
| Running dynamics | — | Yes |
| Grade-adjusted pace | — | Yes |
| Run/Walk/Stand detection | — | Yes |
| Stride length (real time) | — | Yes |
| PacePro™ Pacing Strategies | — | Yes |
| Vertical oscillation and ratio | — | Yes |
| Ground contact time and balance | — | yes (GCT balance with accessory) |
| Course- and weather-specific race predictor | — | Yes |
| Cadence (provides real-time number of steps per minute) | — | Yes |
| Communication Features (with Subscription) | ||
| Gym | Cardio, Elliptical Training, Stair Stepping, Indoor Rowing, Jump Roping | — |
| Swim | Pool Swimming for Kids | — |
| Cycling | Biking, Mountain Biking, Gravel Biking, Bike Commuting, eBiking, Indoor Biking, BMX | — |
| Wellness | Walking, Yoga, Indoor Walking | — |
| In the ring | Boxing, Mixed Martial Arts | — |
| Team sports | Basketball, Volleyball, Field Hockey, Ice Hockey, Football/Soccer, American Football, Lacrosse, Rugby, Ultimate Disc, Cricket, Softball, Baseball | — |
| Motor sports | ATVing, Motocrossing | — |
| On the water | Stand Up Paddleboarding, Kayaking, Fishing, Rowing, Snorkeling. Boating | — |
| Racket sports | Tennis, Pickleball, Badminton, Squash, Table Tennis, Padel, Platform Tennis, Racquetball | — |
| Indoor running | Treadmill Running, Indoor Track Running | — |
| Outdoor running | Running, Outdoor Track Running, Trail Running | — |
| Snow and winter | Skiing, Snowboarding, XC Classic Skiing, Ice Skating, Snowshoeing | — |
| Outdoor recreation | Hiking, Mountaineering, Horseback Riding, Disc Golf, Archery | — |
| Other activity profiles | Inline Skating | — |
| Outdoor Recreation | ||
| Up Ahead | — | Yes |
| TracBack® | — | Yes |
| Back to start | — | Yes |
| Point-to-point navigation | — | Yes |
| Bread crumb trail in real time | — | Yes |
| Mapping & Navigation | ||
| Courses | — | Yes |
| Race an activity | — | Yes |
| Power meter compatible | — | Yes |
| Compatible with Varia™ lights | — | Yes |
| Compatible with Varia headlight camera | — | Yes |
| Speed and cadence sensor support (w/sensor) | — | Yes |
| Bike lap and lap maximum power (with power sensor) | — | Yes |
| Compatible with Varia™ radar (rear-facing radar) | — | Yes |
| Compatible with Vector™ and Rally™ (power meters) | — | Yes |
| Alerts (triggers alarm when you reach goals including time, distance, heart rate or calories) | — | Yes |
| Workout and Training Plans | ||
| Gym | — | Strength, HIIT, Cardio, Elliptical Training, Stair Stepping,, Floor Climbing, Indoor Rowing, Jump Roping |
| Swim | — | Pool Swimming, Open Water Swimming |
| Cycling | — | Biking, Road Biking, Mountain Biking, Gravel Biking, Bike Commuting, Bike Touring, eBiking, eMountain Biking, Indoor Biking, Cyclocross |
| Wellness | — | Walking, Pilates, Yoga , Indoor Walking, Mobility, Breathwork |
| In the ring | — | Boxing, Mixed Martial Arts |
| Team sports | — | Basketball, Volleyball, Field Hockey, Ice Hockey, Football/Soccer, American Football, Lacrosse, Rugby, Ultimate Disc, Cricket, Softball, Baseball |
| Motor sports | — | Motorcycling, Overlanding, Motocrossing, ATVing, Snowmobiling |
| On the water | — | Stand Up Paddleboarding, Rowing, Kayaking, Snorkeling |
| Racket sports | — | Tennis, Pickleball, Badminton, Squash, Table Tennis, Padel, Platform Tennis, Racquetball |
| Indoor running | — | Treadmill Running, Indoor Track Running, Virtual Running |
| Outdoor running | — | Running, Outdoor Track Running, Trail Running, Ultra Running, Obstacle Racing |
| Snow and winter | — | Skiing, Snowboarding, XC Classic Skiing, XC Skate Skiing, Ice Skating, Snowshoeing |
| Outdoor recreation | — | Hiking, Rucking, Mountaineering, Horseback Riding, Disc Golf, Archery |
| Other activity profiles | — | Inline Skating |
| Health & Wellness Monitoring | ||
| GPS | — | Yes |
| Compass | — | Yes |
| GLONASS | — | Yes |
| Galileo | — | Yes |
| Gyroscope | — | Yes |
| Thermometer | — | Yes |
| Accelerometer | — | Yes |
| Ambient light sensor | — | Yes |
| Barometric altimeter | — | Yes |
| Pulse Ox Blood Oxygen Saturation Monitor | — | Yes |
| Garmin Elevate™ wrist heart rate monitor | — | Yes |
Wrist Fit
Garmin Bounce 2
Sits best on wrists ~45–61mm wide (≈ 12.0–16.3cm circumference).
Garmin Forerunner 170
Sits best on wrists ~45–61mm wide (≈ 12.0–16.3cm circumference).
Frequently Asked Questions
Is the Garmin Bounce 2 bigger than the Garmin Forerunner 170?
The Garmin Bounce 2 is bigger — 43mm vs 42.6mm case width.
Which fits a smaller wrist better, the Garmin Bounce 2 or the Garmin Forerunner 170?
The Garmin Bounce 2 suits wrists around 45–61mm wide, and the Garmin Forerunner 170 around 45–61mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Garmin Bounce 2 and Garmin Forerunner 170 side by side at true scale?
Yes — the schematics and photos above show both watches at matched scale, and our fit tool overlays each on your wrist width.