M-Wave Seatpost Clamp with Rack Mounts

This was the exact adapter we needed to attach a rear rack on a trek hybrid 7100 multitrack (2004 model). I will upload a photo to show our set-up. The bike itself doesn't have the typical attach points, and for years, I just used a backpack to haul. But now that my tween is using my bike as a daily commuter to his school, we needed a solution for. Happy to report that this was an exact fit for our seatpost. In order to figure out the correct size, I used a flexible tape measure (like a tailor would use) and measured the circumference. (you could also do this with a narrow strip of paper and then just use a regular ruler to measure the length.) Then some math to solve for the diameter: C=2 * pi * r ==> Diameter = circumference divided by pi (3.14). Then if you need to convert inches to millimeters, multiply inches by 2.54 to get your cm, then move that decimal and voila! (There's online calculators to do all of this for you, too.) This is solid and well made piece. It was easy to install and the hardware that came with his rack threaded in perfectly.

very well made,fit like a glove & fixed the carrier issue easily.

I love this product! It has allowed me to lower the seat on my ebike by about six inches. This is great! Now I can sit on my ebike without feeling like I’m going to fall over, all while retaining my rear basket and removing it’s ridiculous mounting point to my seat post. If I love this product then why only four stars? The mounting holes for the rear basket are far too close. They should be spaced about and inch or two further apart. Yes, they may require a bit more material to build them this way, but in doing so they can alleviate the stress that is placed on the hardware of your rear bracket/basket. Otherwise, it works as intended, and is a good alternate choose to seat post mounting.

My old MTB had no mounting holes for my beautiful new Axiom rear rack so I purchased this M-Wave seat post clamp with mounting holes. I was impressed to find it had been precisely milled. All the holes fit the screws properly. There is even a little ridge around the top of the clamp to insure it sits correctly on the seat post. There are 2 things to be aware of. 1. Make sure you order the correct size. You should measure the outside diameter of the bike's seat post that the clamp fits over and not the seat's post that slides into it. 2. Also safeguard the mounting screws that come with your rack. You will need them. My shorter screws fit perfectly. Now my bike is a power rig that can go anywhere!

This does exactly what I wanted to do. It's strong and fit perfectly. I saw some bad reviews about people feeling like they didn't get the proper size. Please be aware that your seatpost size IS NOT the size to get for this clamp. If you can't find your seatpost clamp size online, contact the manufacturer to ask. My seatpost is something like 27.6mm, but the clamp I needed to get was 31.8mm. As soon as I got it in the mail I checked the size and it was a perfect fit. The only other thing to consider is if your bike frame is designed and rated to handle the abuse of a rear rack and cargo. Sometimes the bike doesn't have the eyelets because it's not meant to carry cargo, so if you're not sure, contact your bike manufacturer to ask. Trek was happy to help me, and it only took a out 5 minutes to get all the info I needed to feel safe getting this and putting a rack on. In case anyone is wondering, I put this on a 2023 Trek FX Sport 6, which is a full carbon fiber frame hybrid bike that is meant to handle moderate gravel and trails. It has eyelets lower on the frame near the cassette for a rack but not on the frame near the seatpost where you'd usually have eyelets for a rear rack, so this product was exactly what I needed.

Installed on a 2024 Trek FX Sport 6 required to mount a rear rack. Replaced the OEM clamp. Simple install. Perfect fit. Screws not provided for rack arms but uses the same as supplied with the rack. Don't remember size.....

Works great, looks great, priced great! I highly recommend this, for adding a connection point for rear racks.

My seat post measures 30.8mm in diameter. This clamp was specified to fit on a 31.8mm post. I was worried that it would be too big. Instead, it was so small I could barely fit it over my post, and had to forcibly spread the clamp. Then the bolt was too short to reach the other side. This is specified completely wrong. Junk.

Very useful if you don’t have the braise ons, it will get you out of trouble!

This is a well made seatpost clamp that enables you to fit a rear rack to frames without eyelets. It fits the seat tube accurately clamps the seatpost well & securely and provides attachment points for a rear rack. It represents exceptional value for money. Just ensure you have measured your bike frame accurately.

Ottimo se non ci sono gli attacchi superiori per il portapacchi

Très bon produit !👍🏻🤩 Belle anodisation ! Qualitatif 👍🏻

Clamps onto my seatpost tightly and does its job well of securing a rack. Although one small complaint I have is that the black paint scratches easily. Other than that, its a great mount for the price.