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The Garmin Speed Sensor 2 is a compact, wireless device that attaches easily to your bike’s wheel hub to provide precise speed and distance data. Featuring Bluetooth and ANT+ connectivity, it syncs effortlessly with Garmin devices and popular fitness apps, delivering reliable performance indoors and outdoors. With a long-lasting battery and IP54 water resistance, it’s built for durability and convenience, helping cyclists track rides and maintain their bikes with confidence.

| ASIN | B07PJKZ7G9 |
| Batteries | 2 Lithium Metal batteries required. (included) |
| Battery Cell Composition | Lithium Manganese Dioxide |
| Best Sellers Rank | #47,986 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #3 in Speedometers |
| Brand | Garmin |
| Color | Multi |
| Connectivity Technology | Bluetooth, Wireless |
| Customer Reviews | 4.5 4.5 out of 5 stars (5,176) |
| Date First Available | April 30, 2019 |
| Department | unisex-adult |
| Global Trade Identification Number | 00753759222536 |
| Human Interface Input | Buttons |
| Included Components | Speed Sensor |
| International Protection Rating | IP54 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 2.89 ounces |
| Item model number | GMS84300 |
| Manufacturer | Garmin |
| Mounting Type | Flange Mount |
| Other display features | Wireless |
| Product Dimensions | 3.25"L x 1.25"W x 0.25"H |
| Sensor Type | Speed Sensor |
| Special features | Bluetooth |
| UPC | 753759222536 |
A**C
Works great
Works great. Long battery life. Hugs center wheel axle well. Only weird issue is configuring it from my watch looks different than configuring it from app - meaning the wheel size. After reaching out to Garmin, I did a wheel out measurement and inputted that into my watch.
A**S
Best Garmin Device Ever
This works great with the app. I first used a Garmin for step counting. Then I got into biking and the steps didn't register. This works great registering bike workouts on the app! The other bike device for motion sold by Garmin doesn't work on the app and you must ONLY buy this one to have the app working with the bike. I love it and use it daily.
M**.
Best affordable bike speedo
I've tried a few cheaper speedometers for my road bike which is used exclusively on a trainer, including Cat Eye. I did one ride with both devices on and found them to be reasonably close over 15'ish miles. I really love how simple it is and how it immediately syncs up with my watch and the Garmin app. I choose to simply read the output directly on my watch so that I don't need to purchase another screen/monitor device. Works great!
R**O
Be on the lookout for possible counterfeit product.
This is my second Speed Sensor 2 from Amazon. First unit purchased last year. Sold and shipped via Amazon. Sync'd with Gamin Connect app. Upgraded firmware. Using the sensor with a 3rd party cycling computer. Zero issues. The second unit I purchased was sold by a 3rd party vendor and shipped by Amazon. I had all sorts of problems with this unit. Problem #1. The unit came up on Garmin Connect app with an odd name. The correct name should be Speed Sensor 2. This unit came up as BSG 2 SPD(?). (I'm not 100% certain what the name was. The unit has already been returned to Amazon.) Problem #2. I could not update the firmware on the sensor. Tried multiple times, got multiple failures. Problem #3. I tried sync'ing the sensor to my cycling computer and it would sporadically send speed info. I have this weird feeling that this is some sort of counterfeit product. Problem #1 and #2 are dead giveaways for counterfeit products. I wrote this review to alert potential buyer to be on the lookout for counterfeit products. My overall rating is based on the legit Speed Sensor I purchased last year. It really works well.
J**O
Light, affordable, and easy to install
Got this for my phone and Garmin Edge 25 computer. Sensor is slightly cheaper than Wahoo sensor. Item was easy to install but the rubber mount is pretty thin and while it doesn’t feel cheap I am curious to see how long it lasts. The sensor itself is very light and was very easy to pair with my phone via Bluetooth. Pairing with my Garmin Edge 25 was a tad tricky and did require me to reset my computer initially to pair correctly. Initially the accuracy seemed a tad off but after a few rides it seemed to calibrate itself. I will say the speed read out is a tad slow to update. When cycling and coming to a full stop the computer still will read MPH if I wear cycling at a very low speed for a moment. Overall probably not 100% needed if you have a computer but could be more accurate especially in areas with poor GPS signal
M**E
Exactly what I needed
Connected right away with a strong signal. I use this with a resistance trainer for Zwift and it works perfectly. I bought this to replace a cheap, off-brand sensor that I got bundled with a trainer. I absolutely love the trainer, but the speed sensor had terrible battery life and stopped working after 350 miles. So far so good with this one. I have high hopes. I've had nothing but good experiences with Garmin. I LOVE my 935. It's never let me down during triathlon training and I'm sure this sensor will be no different.
H**B
Easy to install, easy to use.
I purchased this as a replacement for the previous version of Garmin speed sensor. Not that the old one is broken, but it needed a magnet attached to a spoke for it to work, so it became inflexible. This one just attaches around the hub is easy to install and move to different bikes/wheels without any tools. Pairing it to a bike computer or watch is also very easy, and it self calibrates for wheel size. Very happy.
S**Y
Just doesn’t work
I bought this with a complete disregard for all the negative reviews. Took some effort to get it to wake up and removed the battery. Nothing keeping the battery from making contact. Who knows how long that battery has been active. After a bit of frustration I was able to pair the sensor to my app/watch. Took it for some test rides. It worked just fine. Then of course when I take it out for a trail ride it failed to connect, it failed to turn on and flash the green light. I got nothing and going into the app it showed I had nothing paired for a sensor. Tried once again to go through the process but the sensor just wasn’t turning on. No green light flashing, just dead. It’s a pain to put on and take off and if I have to do that to remove the battery just to get it to wake up… not worth the hassle. Really Garmin, what’s the point of selling these if you keep disappointing your customers and get endless returns. My Garmin watch fails to track my rides accurately, that’s the only reason I bought the speed sensor. I’m just gonna use other apps for now on.
D**O
Tried it with the original battery, and two other new batteries all three times did not work at all. With my iPhone 13 pro max and Zwift.
B**S
as described. fast postage
R**O
Este dispositivo va muy bien, es fácil de instalar y se conecta al tu GPS GARMIN sin ninguna complicación y todo automáticamente, vale algo mas de dinero que otros pero yo he probado los baratos y es tirar el dinero pues se acaban rompiendo, merece la pena gastarte algo mas en uno bueno como éste.
D**E
Délai de livraison très rapide et bien emballé.
B**N
the sensor works as a charm , just plug and play .Garmin is the best ! it was delivered in couple of days despite International shipment . Thanks alot :-)
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