I have a bag on the seat post. Can this be mounted on the seat itself with an adapter?

According to Garmin instructions (available on their web site), the unit has to be in a vertical position (with the accuracy of several degrees. This is because it uses a fairly narrow (40 degrees) 24 GHz radar beam to detect cars. So, it would require a specially designed adapter. Garmin does not make such adapters for attaching radar to the seat because the radar emits 12 dBm (8 mW) of microwave radiation, and for health reasons it must be kept at least 5 cm from your body parts. If you attach it to your seat, you may subject sensitive parts of your body to microwave radiation with a dose higher than the dose which FCC considers safe.

Can this detect when another cyclist is about to overtake you, or can it only detect cars?

Yes it can detect cyclists approaching from behind. Sometimes confusing but it is very helpful as regards approaching cars. It will even show graphically how many cars are approaching. If in a paceline and someone pulls in behind you it will beep as if noting a car and then it will resolve itself pretty quickly. It is a necessity and I don't ride without it now

Has anyone come up with a way to mount this to a bike rack? I have a Bonrager rack if that matters.

I have a Bontrager rack and mounted the unit on a plastic tube that I then attached to the rack with zip ties. Unfortunately this out the unit too far away from the Garmin computer, so sometimes, when the battery was low it would stop working consistently.

Just got this device and mounted on back of seatpost. It does not look/feel secure at all with rubber bands easily slipping. Is this normal?

I didn’t use the bands as I have a saddle bag in the way. There are more secure seat post mounts if you aren’t feeling the bands. I had to spend $45 on a 3D printed Garmin strap clip to attach it to my saddle bag, as Garmin doesn’t make one. C’mon Garmin. I also stuck a zip tie mount for a security cable just in case. More options than an answer good luck.

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Description

🚴‍♂️ Ride Smart, Ride Safe — Radar That Has Your Back!

COMPACT SLEEK - Lightweight 49.9g vertical design mounts discreetly on most road bikes without bulk.
CONNECT YOUR WAY - Pairs effortlessly with Edge bike computers, smartphones, Garmin wearables, and third-party apps.
STAY AHEAD OF TRAFFIC - Detect vehicles approaching from up to 140 meters behind for ultimate rear awareness.
POWER THROUGH YOUR RIDE - Enjoy up to 8 hours of continuous battery life—no mid-ride surprises.
SMART ALERTS SMARTER RIDES - Visual, tone, and vibration alerts keep you informed without distraction.

The GARMIN Varia RVR315 is a compact rearview radar designed for road cyclists, providing visual and audible alerts for vehicles approaching from behind up to 140 meters away. It offers up to 8 hours of battery life and pairs seamlessly with Garmin Edge devices, compatible smartphones, wearables, and third-party apps, enhancing rider safety with real-time, multi-sensory notifications.

Specifications

Battery description	Lithium-Ion
Number of batteries	1 Lithium Ion batteries required. (included)
Control method	App
Mounting type	Seatpost Mount
Maximum range	153 Yards
Sensor technology	Radar
UPC	753759242152 753759242169
Manufacturer	GARMIN
Product Dimensions	15.24 x 7.62 x 7.62 cm; 49.9 g
Batteries	1 Lithium Ion batteries required. (included)
Item model number	010-02252-00
Connectivity technologies	ANT+
Special features	Maximum Awareness; Multiple Pairing Options; Works with The Varia App; Third-Party App Compatible; Compact Design
Other display features	Sports
Human interface input	Buttons
Color	Multi
Whats in the box	RVR315; Mounting hardware; Power cable; Documentation
Item Weight	49.9 g

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