KOM CyclingRadar Mount for Rear Bike Cargo Racks - Garmin Varia Tail Light Models Including RTL515, RTL510, RVR315, Magene L508 - 3D Printed Construction

Recently purchased the new "Race Case" from Cruzbike to use on my S40 and V20. When I bought it, I knew it had mount holes available through the back for a light or radar and such but did not know how I would actually use them to mount my radar. I discovered this little mount. It is very simple and worked like a champ (It was exactly what I would have made if I had a working 3D printer). The only issue I had was that, as delivered, it was set up for horizontal mounting so I had to carefully unscrew the actual mount piece and rotate it 90º and re-screew - have to be very careful here as the screws just self-thread into the plastic so stripping the threads by over-tightening could be a real problem resulting in mount failing.A bit expensive for a little piece of plastic, but surprisingly no or little competition, so worth it for what I needed.

I got this to use it on the back rack for my radar on a bike. I had to tap the rack back plate to mount it but the slot on the mount makes it super easy to adapt to any size. It is solid and working great.

I keep a trunk bag on my rear rack most of the time that blocks anything attached to the seat post. Garmin doesn't seem to make a solution for this so I'm happy I found this product. My Varia works great attached to this mount on my rear rack.

Irritating 'little detail' - the allen wrench included did not fit the attachment bolts. Had to go out and buy one that fit.

Bought this for use with Caria radar. So far so good. Easy to mount with correct Allen wrench. I’m going to continue to evaluate against mounting on the rack bag. Six inches higher might give the radar more vision.

Mounted on trunk bag instead of rack. Aria unit stays cleaner. Put a sheet of heavy plastic on inside of bag to stiffen back wall of bag.

This mount works perfectly, and does exactly what is intended. I bolted this up to my Sunlite flip-top rack, and (after rotating the mount to match my light) slapped my taillight on. Perfect, and all of the required hardware is included.The only real complaints I have are in durability. With being 3D printed, the section that bolts to the rack doesn't feel quite as sturdy as I'd like. It's not completely flimsy, but it just felt 'meh'. It's a part that shouldn't take much force, so it should be okay. The print quality itself is very good, at least, with a sandy surface finish. The actual bayonet, where the light attaches, is injection molded and feels much stronger.I also wish they had used threaded inserts where the two pieces screw together. I had to turn the mount for my light, and found that the screws thread directly into the 3D printed bracket. Again, it's not going to instantly break apart, but I felt I needed to be extra careful not to overtighten.I might seem like I'm being a little harsh, but aside from that it's great. It fit the rack and holds my Magene L308 light securely. The design is very purposeful and discrete, and looks much better than wrapping the elastomer band-style mount around the rack's mounting tabs. I do think it's a little expensive for something 3D printed, but nobody else makes something like this as a commercial product. I give it a thumbs up.

While I've had durability issues with other plastic Garmin-style mounts, this one seems tough enough that it will be fine for my use, bolted onto the back of a rack. It's all plastic, though sort of strong by my estimate. The included wrench is the correct size, but the Allen wrench is too big for the bolt.