| (link) | (link) | (link) | |
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| Best Price right now on Amazon | Best Price on Amazon Right Now: (link) | Best Price on Amazon Right Now: (link) | Best Price on Amazon Right Now: (link) |
| Size | 1.9" x 3.2" x 0.8" (50 x 82 x 20 mm) | 1.9" x 3.2" x 0.8" (50 x 82 x 20 mm) | 2.3" x 4.5" x 0.8" (58 x 114 x 21 mm) |
| Processing speed | Double the speed of the 520 Plus | Double the speed of the 820 | Not as fast as the other two |
| Weight | 2.7 oz (75.8 g) | 2.8 oz (79.1 g) | 4.8 oz (123 g) |
| Waterproof rating | IPX 7 (you can drop it in 3 feet of water for up to 30 minutes, and it will still work) | IPX 7 | IPX 7 |
| Screen size | 2.6" (66.04 mm) | 2.6" (66.04 mm) | 3.5" (88.9 mm) |
| Display resolution | 246 x 322 pixels, color | 246 x 322 pixels, color | 282 x 470 pixels, color |
| Touchscreen or button control? | Button control | Touchscreen, much improved over the 820 | Touchscreen |
| Battery Life | Up to 20 hours GPS training mode | Up to 20 hours GPS training mode | Up to 15 hours GPS training mode |
| Battery Save Mode (extends battery life by up to 50% while still tracking all ride data) | Yes | Yes | Yes |
| Option to add Garmin Charge Power Pack (to double battery life)? | Yes | Yes | Yes |
| Bike alarm that connects with your phone? | Yes | Yes | No |
| Find my bike computer? | Yes | Yes | No |
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| Maps & Navigation | | | |
| Satellite Systems: | GPS/GLONASS | GPS/GLONASS/Galileo | GPS/GLONASS |
| Basemap | Pre-loaded Garmin Cycle Map with Integrated TrailForks content | Pre-loaded Garmin Cycle Map with Integrated TrailForks content | Pre-loaded Garmin Cycle Map |
| Address search (input address and it will plot a route)? | No | Yes | Yes |
| Popularity routing (Trendline) - shows routes used most by cyclists? | Yes | Yes | Yes |
| Turn-by-turn navigation? | Yes | Yes | Yes |
| Recalculate route on the device? | Yes | Yes | Yes |
| Calculate route back to start? | Yes | Yes | Yes |
| Create a route on the unit? | No | Yes | Yes |
| Create a round-trip route on the device? | No | Yes | Yes |
| Find nearby POI (points of interest)? | No | Yes | Yes |
| (link) | (link) | (link) |
| Connected Features | | | |
| Smart notifications? | Yes | Yes | Yes |
| Rider to Rider messaging? | Yes | Yes | Yes |
| Garmin Connect compatible? | Yes | Yes | Yes |
| Automatically syncs your rides? | Yes | Yes | Yes |
| ANT+ (to connect your devices? | Yes | Yes | Yes |
| Bluetooth Smart (aka BLE or Bluetooth Low Energy)? | Yes | Yes | Yes |
| Unit to unit transfer (share your data with friends with similar units)? | Yes | Yes | No |
| Incident detection (so someone is automatically notified if you have an accident)? | Yes | Yes | Yes |
| LEV/ebike compatibility via ANT+? | Yes | Yes | Yes |
| Compatible with heart rate monitors, plus speed and cadence sensors? | Yes | Yes | Yes |
| ANT+ shifting? | Yes | Yes | Yes |
| Shimano Di2 electronic shifting integration? | Yes | Yes | Yes |
| Can it download free apps and widgets from the Connect IQ™ store? | Yes | Yes | Yes |
| (link) | (link) | (link) |
| Training Features | | | |
| Calories burned? | Yes | Yes | Yes |
| Interval training? | Yes | Yes | Yes |
| Advanced workouts? (so you can create customized, goal-directed workouts) | Yes (much improved over 520 Plus) | Yes (much improved over 820) | Yes |
| Virtual Partner (so you can compete against a digital cyclist)? | Yes | Yes | Yes |
| VO2 Max estimate? (the maximum amount of oxygen a person can utilize during intense exercise) | Yes | Yes | Yes |
| FTP tracking? (Functional Threshold Power is the average power that a rider can produce over the course of an hour) | Yes | Yes | Yes |
| Recovery time? | Yes | Yes | Yes |
| Time in heart rate training zone? | Yes | Yes | Yes |
| TrainingPeaks iLevels (WKO4) | Yes | Yes | Yes |
| ClimpPro (new feature that shows you graphically the grades ahead)? | Yes | Yes | No |
| Performance Power Curve? (tracks your power output over periods of time) | Yes | Yes | No |
| Does it compute calories based on heart rate? | Yes | Yes | Yes |
| Strava Live Segments on the unit? | Yes | Yes | Yes |
| Aerobic training effect? | Yes | Yes | Yes |
| Heat acclimation (how well are you adjusting to heat)? | Yes | Yes | No |
| Altitude acclimation (how well are you adjusting to changes in altitude)? | Yes | Yes | No |
| Water and calorie requirements (reminders based on course)? | Yes | Yes | No |
| (link) | (link) | (link) |
| Mountain Bike Metrics | | | |
| Grit rating (how tough is the route)? | Yes | Yes | No |
| Flow rating (how well did you ride the route)? | Yes | Yes | No |
| Hang time (how long were you in the air when jumping, how far did you go)? | Yes | Yes | No |
| Integrated Trailforks? (130,000 trails preloaded on unit) | Yes | Yes | No |
