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 — Never Miss a Beat Behind You!

SMART ALERTS - Visual, tone, and vibration notifications keep you informed without distraction.
COMPACT SLEEK - Vertical, lightweight design mounts easily on most road bike seatposts without bulk.
LONG LASTING POWER - Up to 8 hours of continuous battery life keeps you covered on long rides.
SEAMLESS CONNECTIVITY - Pairs effortlessly with Edge bike computers, smartphones, Garmin wearables, and third-party apps like Ride with GPS.
STAY AHEAD OF TRAFFIC - Detect vehicles approaching from behind up to 153 yards for ultimate road awareness.

The GARMIN Varia RVR315 is a compact rearview radar designed for cyclists, providing visual and audible alerts for vehicles approaching from behind up to 153 yards away. It pairs with Garmin Edge computers, compatible smartphones, and wearables, integrating with apps like Ride with GPS. Featuring a sleek seatpost mount, up to 8 hours of battery life, and multiple alert modes, it enhances rider safety and situational awareness on every ride.

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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