Bests & Worsts Reviews from Amazon

I bought two, and I've had them now for 2 weeks. My use is on a bicycle. The valve is schrader (not presta). I thought these would illuminate upon the spinning of the wheel due to the outward force. But in actuality, in a bicycle application, they do not. They do illuminate (or blink) upon shock. On a bicycle, when going over bumps at moderate speed, they do light up and are quite attention-getting at night. Interestingly, and higher bicycle speeds (>10 mph), even a bumpy road will not make them light. Perhaps this is because the outward spin force is greater than the shock (or impluse) force from each bump. The lighting described above does not matter if it is daylight or night. They survived a 15 minute ride in a moderate rain just fine.