KOM Cycling for Garmin Varia Mount Tail Light Models Including RTL515, RTL510, RVR315, Magene L508 Featuring an ATOP Dial for Security - Varia Seatpost Radar Mount and Under Saddle Mount

I haven’t ridden with this mount as of this writing but it sure looks sturdy. Although there is a little sway side to side, it won’t get dislodge during the ride. Definitely secure vertically. I actually bounced the rear wheel quite hard and it didn’t move a mm up or down or sideways. I used the optional wedge which worked well with my Madone Gen 8 Seatpost. See pics. I only hope that the non abrasive cable would last a long time and won’t get cut. It is actually a good material choice since it will not damage carbon. I will still put a plastic film similar to ride wrap just to make sure paint won’t be damage during normal use.

I ordered this as an alternative to saddle bag mount. Once it arrived, the insert (similar to original Garmin mount) was for an oval or round shaped seatpost. I have an aero bike with rounded front and flat back ("D" shaped). Once I identified this, I was frustrated as it wouldn't work and I began refund steps. Before sending, I reached out to KOM seller and he quickly responded to my msg and sent a prototype to accommodate my seatpost. It works great. Highly recommend.

It's a great idea using the fast twist closure BOA-like system. It holds well enough and doesn't mar the seatpost. Only 4 stars though because the rubber channel doesn't fit the square-backed seatpost on my 2023 Canyon Aeroad. Would be better if it came with an interchangeable rubber piece like the original Garmin mounts do. It stays in place, but pretty obvious when looking at it that it doesn't fit right. Price is also a little steep, but I get there's a probably a royalty on the closure system.

This is a solid, secure mount for my 34.9 mm diameter GoCycle G4i seat post. To prevent lateral movement after installation, I found it helpful to firmly press and hold the quarter-turn mount against the seat post so the rubber can conform to the post shape. While continuing to push the mount against the post, tighten the ATOP system until secure. Done right, the mount should not move up and down or side to side. It is much better-looking and more secure than the stock Garmin mount and, unlike the optional Garmin mount that can be screwed to a seat post, this fits a GoCycle.

UPDATE: As I said I would, I wrapped a piece of 3M Protective Tape around the section of seat post and the mount seemed to grip A LOT better -- almost no slipping down and harder to rotate the Varia. I took it on a 64-mile ride that included some very bumpy asphalt and the unit barely moved, but certainly never loosened or slipped down and failed as it had during an 18-mile ride on smooth roads. One thing I plan to redo, is wrap a longer section of the seat post, to give the mount a chance to settle into a spot that's still wrapped with the tape, because the wires held their position but the rubber grip did tend to want a lower spot than the wires (as you can see in my photo).CONCLUSION: KOM should include a small supply of Protective Tape - otherwise, this thing DOES NOT WORK for carbon seat post finishes - it just doesn't. Giving it three stars, up from just two.FIRST REVIEW: As others have reported, on a round, carbon seat post, it does not hold securely. I made sure the post was clean (with rubbing alcohol) before mounting and even with the "Boa" clamp as tight as possible, it seemed tight when I started the ride, but after 15 miles, on average pavement I noticed it had fallen almost three (3) inches. I had my doubts it was going to work, even before the ride because it was pretty easy to rotate/swivel the mount. Now, I'm sure KOM put this product out there and mostly didn't care. The rubber just isn't soft and grippy enough for smooth, round, carbon (matte finish) seat posts -- period. For $39, this single-function, basic accessory should do its job with no accommodations necessary.KOM, I'm going to try and make up for your indifference by wrapping my seat post with a piece of 3M protective tape, which I happen to have and which seems to want to grip you rubber insert a bit better than my seat post surface. I'll report back. If that works for me, I might keep your over-priced accessory.

Love this. Fits my trek speed concept. Easy to use. Secure.

Once the mount arrived, I double checked the product description that it indeed works w/ D-shaped seat posts. Upon closer inspection it does NOT. Unless you don't mind your light/radar combo sitting 45 degrees off center, I would avoid this product. Doesn't work on either a 2020 Trek Madone or 2022 BMC Teammachine. The problem is the back of the seat posts are flat and the shape of the mount is V-shaped. The mount will vibrate while riding, turn 45 deg and slide down to where the seat post and top tube meet. No bueno! Especially when a $300 radar light is attached. The bait and switch: "works with D-shaped posts...... if you purchase an additional adapter through KOMs website for $1 + an additional $4 shipping." Seems to me, if it claims to fit on Amazon, the necessary adapters should be included.

Product was really well made and would have worked IF my Cycliq Fly6 would have worked. Cycliq has their own design which is horrible and don’t make an attachment to use this awesome product. So, I had to return the KOM product. 😢