6 PCS Car Wheel Hub Light, PVC Shell Hot Wheels Breathing Flash Light Tire Valve Pop-up Flash Light, Modified Decorative Accessories, Suitable for Cars, Bicycles, Motorcycles (Multicolored)

I recently added this Wheel Hub Light to my Northrock XC27 Mountain Bike (from Costco), and I'm really happy with how they look and work. Per specs, these lights are designed for cars and motorcycles, but they fit perfectly on my bike. What I like most about them is the extra safety they provide when I'm riding the trail at night. The red lights are bright and make sure I'm seen by others, which is super important to me.The lights have a PVC shell, which makes them seem sturdy. I've been using them for a while now, and they've held up really well, even on rough trails. Plus, the battery life has been impressive; I haven't needed to replace the batteries (yet).I'll make sure to update this review if anything changes, but so far, these lights have been a great addition to my bike. They're simple, effective, and make trail rides safer and more fun after dark.

The media could not be loaded.  These lights replace the valve stem cap on your wheels. They are motion activated and contain 3 batteries each. The problem is that the motion detection does not seem to work very well. Some will stay on forever, until the batteries go dead. There are 6 that come in the pack, i'm assuming because of the problem. One of these had dead batteries right out of the pack, and another would not go off so it died the next day.