Garmin Varia RVR315, Cycling Rearview Radar with Visual and Audible Alerts for Vehicles Up to 153 Yards Away

This has quickly become the most important cycling accessories I own and will literally not road cycle without it. I have lights front and rear that I always ride with, but this little gadget gives me warnings and situational awareness especially when I'm on a steep descent. It integrated seamlessly with my Garmin head unit and lets me know how many cars are back and rate of closure speed. Charging it is really simple and it last for hours. Its very accurate and will discriminate multiple cars. It does pick up faster riders (which happens a lot to me!) and won't alarm in a pelaton. I like the small, no light version as it was easier to mount and I tend to keep my rear light higher up. If you ride a lot, just get it!

Great product but I will recommend to buy the one with blinker light.

The Varia model tested was the RVR315 without the taillight (with the light it’s model RTL515).First of all, it’s a solid Garmin product. It is supplied with 3 seat post profile inserts and two sizes of O-rings to fasten the unit to the bike seat post. A micro USB cord is supplied for connection to a power source (not supplied). The charging port is protected by a well -designed cover but care should be taken when inserting the USB plug. As with all USB sockets, the unit can be damaged if the plug is inserted incorrectly or with excessive force. Battery life seems to be 3-4 hours. Battery is also reported on the Varia App screen.The RVR315 was tested with an iPhone 7 using the Garmin Varia App and the RidewithGPS App. The unit easily paired with both apps and will alert you if pairing fails during a ride.The radar will detect multiple cars behind you at up to153 yards as claimed. The unit does not report “all clear” unit the last car detected has passed you (great when you can’t see them all). However when you turn onto a side street and a car turns with you, the detection may be mixed. When riding straight and a car turns out of a side street behind you, the Varia takes a moment to detect the vehicle and it may not be detected until it is right on top of you. Overall the performance is quite impressive, it picks up vehicles at a distance and will alert you well before you can hear a vehicle approaching.VARIA AppThe app is streamlined with options to select some sounds/vibrations on the interface. The app displays a high contrast track on the phone that is readable even in bright daylight. Be aware the app does not sleep so the screen is using more battery time. Audio signal volume is moderate but adequate.RIDEwithGPS AppAfter pairing with the app, RwGPS adds a graphic track to the left/right side of the screen (your choice). It displays well, but the track is not displayed as well as the VARIA app. Also the RwGPS screen may enter sleep mode if selected and you lose the visual display, but the audible alerts will still be heard.Bluetooth Audio with Both AppsIt is possible to pair an external Bluetooth speaker with the app/phone to increase the audible announcements, but the results may be mixed with the external Bluetooth unit. An older Bluetooth 3.0 speaker did not report all of the expected tones all of time. Some alerts remain silent even as the phone app showed an approaching vehicle. When a Bluetooth 5.0 speaker was paired, the unit reported the audible alerts consistently. One curious note is that depending on the app or the external speaker the audible alerts may be slightly different tones.City riding with the Varia may yield some spurious results but it still quite good. Out on the longer stretches it is very consistent. In both scenarios it adds a safety factor that is hard to beat for any serious cyclist.

I debated for a long time about buying a Varia. I was getting a bit tired of all the accessories on my bike. But when this one went on sale, I jumped. It was very easy to set up with my Garmin and works well. I have issues with turning my head and haven't found a rearview mirror I like, so this makes me feel safer. I chose the Varia without the light because I was afraid the larger version wouldn't fit on my seat post under Cannondale's built-in light.

The radar function works well, no false negatives but plenty of false positives. You shouldn't depend on it as your only warning for traffic coming from the rear, a mirror, your ears, and turning your head around every now and then is good practice. While the range meets it's spec, where I ride cars and pick-ups frequently pass you at 70+ mph on two lane country roads, with this (or any) radar that is only about 3 seconds. I can usually hear the car and see them in my mirror before the radar gives a warning. Still it's great to have when your attention wanders. The included mounts should fit most seatposts whether they're round or aero. My on demerit is the battery life, about 7.5 hours. I frequently ride 100 mile+ rides and the radar dies before the end. Also the charge port is a micro USB not the more common USB-C, I'd like to see that updated along with the battery life.

I absolutely love this thing. It gives me such a feeling of confidence riding on the roads, which I have to do. It alerts me to cars approaching well before I can even see them in my mirror. So there are no "surprise cars" like there can be with my mirrors. It also tells me if there are several cars coming, so one car cannot hide behind the other and fool you. If I would lose this detector I would buy another immediately.Most people say this device is good at letting them know when there is a car approaching, but I think they have it backwards. The most useful feature of this device is it tells you when there ISN'T a car. Need to go around a pothole, dodge a stick, or change lanes for a left turn? You know with a glance that there is no car behind you. Priceless.Although the detector can be used with other Garmin devices, I just use it with the Android App on my smartphone. There is no need to buy any other devices.I have used this for about six months and in all that time I had one false negative when I first mounted it on my bike - it said there was no car when there was. But I think that was because I had it mounted in a place where my cargo carrier interfered with it. I moved it to the rear of the carrier and it has been 100% accurate since. No false positives and no false negatives in literally hundreds of car interactions.If you listen to music through earbuds, the app dings on top of the song to let you know it has detected a car approaching. Very handy.This thing is brilliant. I love it. It really gives me confidence in my commute.