Trek has a family of mounts called “Blendr” and they fit with a mating piece on their specific stems. While they don’t out and out say it, it’s a GoPro style friction mount. So if you get the Blendr piece and have a GoPro mount on your bike, then the light attaches to those.

There are a number of ways to get a GoPro mount on the front of your bike. Many of the computer mounts have them or can add them. I use the K-edge mounts and they works great but BarFly and others also offer them.

I did find a really neat GoPro mount that replaces one of the spacers on your steer tube. You can get that from Lupine Lights or else there is one from Amazon too.

But one of the easiest ways to use the Ion on the front is to get an additional REAR mount, flip it upside down to fix the angle (head tube angle and seat tube angle are the same), and then put it around your head tube. That puts it at the correct angle facing forward and will get you up and running the fastest. That’s also available from the Trek website and from your local Trek dealer.