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Edge 840 Computer

4.406666666666666 out of 5 stars
150 Reviews



Why We Like The Garmin Edge 840 Computer

Our search for an advanced GPS cycling computer that meets our needs ends with the Garmin Edge 840 Computer. Its touch screen and streamlined user interface make it easy to swipe and tap to our desired screen to access important information. Pairing our device with a compatible heart rate monitor or power meter lets us see live power targets and stamina insights as we ride and receive personalized adaptive coaching and workouts based on our current training load. The superior battery life keeps us riding as long as we desire, while the included multi-band GNSS technology provides superior location accuracy even in a dense forest or high up in a canyon.


  • A touch screen cycling computer with advanced GPS navigation
  • Provides personalized coaching and workouts with a HRM or power meter
  • GNSS multi-band technology delivers pinpoint accuracy in any location
  • Responsive touch screen and button controls for friendly use
  • ClimbPro planner keeps us climbing by showing remaining ascent/grade %
  • Ride-specific maps show popular trails, roads, and points of interest
  • Use for up to 26hrs in demanding use and 42hrs in battery saver mode
  • Includes an out-front and standard mount for two mounting options
  • Item #GRMF06I
Housing Material
Battery Type
Lithium ion cell contained in equipment
Battery Life
[demanding use] up to 26 hours, [battery saver mode] up to 42 hours
Low Battery Indicator
Mount Type
out-front mount, standard mount
Edge 840, out-front mount, standard mount, tether, USB-C cable, documentation
2.3 x 3.4 x 0.8in
Face Size
2.6in diagonal
Claimed Weight
cross-country, enduro, gravel, road cycling, trail
Manufacturer Warranty

Overall Rating

4.5 based on 150 ratings

Review Summary

1 Stars - 6 reviews
2 Stars - 5 reviews
3 Stars - 12 reviews
4 Stars - 26 reviews
5 Stars - 101 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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1 out of 5 stars

June 20, 2024

To much going on

Sorry I do not like it, my wife purchased this unit for me at your unbound gravel expo booth. I would like to send it back to you. I understand it's used now but I have taken it off my bike and going back to the other brand. To many things going on, things I don't care about and to many buttons to try and navigate through while riding my bike. Can we get it sent back?


Originally reviewed on Garmin

3 out of 5 stars

June 18, 2024

Great product that has become obsolete.

I am sorry, but bike computers are obsolete. Just get a decent phone case, download the Strava app or any other cycling/activity app and avoid yet another $400 gadget that we dont need.

Jason J
5 out of 5 stars

June 17, 2024

Edge 840

Replaced my 8 year old Garmin 520. Im glad I went for the touch screen option. This is a quality product in typical Garmin fashion. I only wish Garmin would improve the intuitiveness of their products

NR 10

Originally reviewed on Garmin

4 out of 5 stars

June 15, 2024

Some improvements, but a couple of annoyances

I bought the E-840 because, after 5+ years, battery time on my beloved E-830 was weakening. If upgrading from the E-830, there IS a learning curve! It seems to remember the censors to which it is paired a bit better than on the 830 (especially the cadence as I use this on two different bikes. However, some NetIQ apps are gone, and the NetIQ "store" is a mess right now. Even if searching for an Edge applet, you will be presented with hundreds of watch faces! The new chip in the 840 is much faster than for the 830, which I appreciate on climbs. The display is also a bit larger - great for those of us in our 70s! Also, navigation prompts appear to come more quickly than before. The annoyances - it beeps for too many reasons, many of which I have yet to determine. After a ride is completed, it takes a LONG time to sync with my phone, even though the display claims it has. Too often when looking at Connect, I have to go back to my Edge and power it on and wait for the upload to complete. What it will sync to is my RideWithGPS library. It copies each ride (aborted or not!) to my RW-GPS library, cluttering it up. (I could probably find a way t stop this, but...) After I complete a ride, things get a bit confusing. I hit the stop button, but rather than showing the default fields for my profile, I get a long list of options, etc. Up in the corner, I see "Save" buttons, which recur as I scroll through the windows. Thing is, I'm never sure if I'm shutting it down in a way that does not destroy my ride data. (Oh yeah - sometmes when it syncs I find the ride was entered ot a time 12 hours previous. It's getting better now... CONCLUSION - if this is your first Edge, or if you are upgrading from a 500 or 150, it is absolutely FABULOUS! If you're upgrading from an 800, you're facing a learning curve and some work. Still, I'm glad I bought the 840!


Originally reviewed on Garmin

3 out of 5 stars

June 15, 2024

On the fence

Hopefully I will update. I am pretty sure that eventually I will love it. The learning curve is real. I have spent quite a bit of time with youtube and manuals, but I am still struggling


Originally reviewed on Garmin

4 out of 5 stars

June 15, 2024


I am new to Garmin GPS devices + must express my exhaustion of figuring out how to choose preference of functions….How to input trips from other navigational Apps. If Garmin chooses NOT to include an instructional flowchart of options, setup + use, at least include a hardcopy of a few YouTube info sites. (Regardless, I will be making a trans-America bike ride May 2025 + would not do it without such Garmin technology)


Originally reviewed on Garmin

2 out of 5 stars

June 10, 2024

Sweet when it works...

I've used it several times

I have had nothing but troubles with this computer. The touch screen is nothing short of finnicky.... This is like the original touch screen cell phones... Mediocre at best. Tons of what appears to be software issues. The few times it does work its pretty sweet. I would NOT purchase again.


Originally reviewed on Backcountry.com

3 out of 5 stars

June 10, 2024

It has potential

I bought this a few weeks ago and I can’t get it to sync with the heart rate monitor and the cadence only shows sporadically. I love the touch screen, much easier than my 830.


Originally reviewed on Garmin

5 out of 5 stars

June 9, 2024

Easy to use and accurate so far

I have had this for about three weeks. The first week it was cold and rainy, but I did my best to read the directions and set it up. I have had a Polar The second week I got on my bike for a short ride to see if it worked as expected. I found I had several questions and called Garmin to get them answered, they answered them well. This week I used it twice after again asking a few questions, it worked as I wanted, and I am now able to change the display while riding and it really works well. So far, I am glad I decided to spend the extra money and get the Garmin It is easy to read for me. I still want to use more of the available features, but it works very well so far. It definitely outperforms the old Polar I had, and a couple of cheaper computers I tried.

Originally reviewed on Garmin

5 out of 5 stars

June 9, 2024

The Supercomputer for the bike!!!!

Out of the box it is a supercomputer reading the manual and setting it up you have a supercomputer on your handlebars. The 840 can be configured to provide information on everything but the amount of air in your spare tube. The distance, time, splits, incline\decline status, phenomenal battery life, and touchscreen is so far above the rest you are selling yourself short not to use this. The screen is easy to read, and the sun glare is never an issue. It is very feature rich and severe weatherproof.


Originally reviewed on Garmin