Review on 🚦 Cygolite Hotshot Pro– 200 Lumen Bike Tail Light [HARD MOUNT VERSION]– 6 Modes for Night & Day with Adjustable Flash Speeds – Compact Design– IP64 Water Resistant– USB Rechargeable– Ideal for High-Traffic Roads by Jason King

I have the fixed mount version, not the flex mount version. I asked a question about this product and asked if it would fit the aerodynamic seat. Someone said it would fit an aero seatpost but it does NOT fit. Now I've spent another nine bucks to buy another mount direct from Cygolit so I can use this light. Only answer questions about a product if you KNOW the correct answer. And for God's sake, folks, stop answering "I don't know" questions. It is of no use to anyone!