SerfasTST Bicycle Tail Light Saddle Rail Mount - UNI-Rail

This mount should come by default with lights. It attaches securely beneath the saddle, and I have no worries about it falling off. I also like that it lets the light be horizontal to give a bit more visibility than a vertical mount.

Ordered to attach a rear bike light, works great

Seemed good enough on quality, but the notches didn't fit the saddle rails.

Product delivered as advertised

Solid mount for their tail light, just wish it was a little wider so I could slide it back further on the rails.

I use this mount with my Thunderbolt 2.0 tail light. I flipped the mounting screw/nut and it places the light really nice and tucked up under the seat in a horizontal position. A saddle bag would probably block the light a little but i use a top tube bag on my road bike so there is no issue.

The mounting part is too narrow, so you cannot mount the light above the bag at the wide part of the saddle rails.

Incredible product. Holds the taillights in the most difficult terrain. Ideal to dropper post with a vulcan 350.