It has to fit an aero seatpost properly.
The Defy Advanced has one of these seatposts. All the rear lights I've bought so far have mounts designed to fit round seatposts. They are fine for the alu bike, but I don't see them staying put on the carbon one.
Can anyone recommend a rear light that will mount properly? It doesn't need to be immensely powerful, it's more just to be seen with if I'm taking the carbon bike out at night.
The Defy Advanced has one of these seatposts. All the rear lights I've bought so far have mounts designed to fit round seatposts. They are fine for the alu bike, but I don't see them staying put on the carbon one.
Can anyone recommend a rear light that will mount properly? It doesn't need to be immensely powerful, it's more just to be seen with if I'm taking the carbon bike out at night.