Lezyne Saddle Ai Alert 250 Rear Light

The Lezyne Saddle Ai Alert 250 Rear Light mounts under your saddle and does something most rear lights don't — it detects when you're decelerating and automatically intensifies to alert riders and drivers behind you. The housing is CNC-machined aluminum, and the optics deliver 270-degree visibility so you're seen from the side as well as directly behind. USB-C charging and a tool-free detach mount mean it's ready to go without much fuss.

Eight output modes give you a lot of flexibility across conditions. Active Alert mode pushes 250 lumens when the light senses braking; dedicated daytime flash patterns keep you visible in bright conditions; and Femto mode stretches runtime to 60 hours when you just need a background presence on longer, multi-day efforts. The unit is fully waterproof, so output mode is the only adjustment you'll need to make regardless of the weather.

Lezyne Saddle Ai Alert 250 Specs at a Glance

• Max output: 250 lumens (Active Alert mode)
• Output modes: 8 modes, including daytime flash patterns
• Max runtime: 60 hours (Femto mode)
• Visibility: 270 degrees via wide-angle optics
• Construction: CNC-machined aluminum, waterproof
• Charging: USB-C, tool-free saddle mount