Knog Cobber Reflex Rear Light

The Knog Cobber Reflex Rear Light is an intelligent bike light designed to maximize rider visibility in changing road conditions. Featuring innovative Adaptive Reflex Technology, the Cobber Reflex automatically responds to your riding behavior by adjusting its light output based on bike lean angle, speed, and braking, helping you stay visible exactly when it matters most.

Unlike conventional rear lights, the Cobber Reflex uses advanced sensors to create dynamic lighting patterns. Reflex Tilt Mode reacts to your bike's lean angle by strobing in the corresponding direction, while Reflex Brake Mode automatically increases brightness when deceleration is detected, providing a clear warning signal to riders and vehicles behind you.

Delivering an impressive 250 lumens and a massive 330° beam angle, the Cobber Reflex ensures exceptional visibility from multiple directions. The integrated quick-release mounting system provides a secure fit on both standard and aero seatposts, while USB-C charging and ModeMaker 2.0 compatibility allow riders to customize lighting modes to suit their riding style.

With intelligent auto on/off functionality, IP67 waterproof protection, and up to 70 hours of runtime, the Knog Cobber Reflex Rear Light is built for commuters, road cyclists, gravel riders, and anyone seeking the latest in cycling safety technology.

Features

Adaptive Reflex Technology

• Intelligently responds to speed, braking, and bike lean angle
• Automatically adjusts light behavior for enhanced visibility
• Improves rider awareness in changing traffic conditions
• Designed to maximize safety on unpredictable roads

Reflex Tilt Mode

• Light pattern responds to bike lean angle
• Strobes in the corresponding direction when cornering
• Provides additional visual cues to surrounding road users

Reflex Brake Mode

• Automatically detects deceleration
• Brightness spikes during braking for improved visibility
• Alerts following riders and vehicles more effectively

Maximum Visibility

• Powerful 250-lumen rear light output
• Massive 330° beam angle for side and rear visibility
• Enhances rider presence across multiple lanes
• Ideal for urban commuting, road cycling, and gravel riding

Customizable Lighting Modes

• 4 pre-programmed steady and flashing modes
• Compatible with Knog ModeMaker 2.0 Web-USB software
• Create and customize lighting patterns to suit your ride

Smart Convenience

• Intelligent auto on/off functionality conserves battery life
• Movement detection automatically powers the light on and off
• USB-C rechargeable design for fast charging
• Battery and charging status indicators built into the button LEDs

Built for All Conditions

• 100% waterproof with IP67 rating
• Robust integrated quick-release mounting system
• Compatible with standard and aero seatposts
• Designed for daily commuting and all-weather riding

Runtime Performance

• Up to 70 hours runtime in ECO mode
• Up to 8 hours runtime in HYPE mode
• Optimized balance of brightness and battery efficiency

What's Included

• Knog Cobber Reflex Rear Light
• Knog Clasp
• Small silicone strap
• Medium silicone strap
• Large silicone strap
• Fits seatposts and frames from 22mm to 32mm+

Specifications

• Bulb type: Chip On Board (COB) LEDs
• Battery: 3.7V 800mAH
• Light output range: 15 to 250
• Run-time: 2 to 100hrs
• Light modes: 8
• Lumens: 75 (High), 20 (Low), 250 (Hype), 20 (Eco)
• Runtime: 2.5hrs (High), 8hrs (Low), 8hrs (Hype), 70hrs (Eco)
• Programmable with modemaker: Yes
• Aero seatpost compatible: Yes
• Low battery indicator: Yes
• Fits posts & bars: 22mm to 32mm+ diameter
• Charge time: 4hrs
• Rechargeable: Yes, USB-C Rechargeable (Cable not included)
• Weight: 39g (1.4oz)
• Dimensions: 28mm (H) x 43mm (W) x 62mm (L)
• Waterproof: IP67 rating
• Strap material: Medical grade silicone
• Operating temperature: -20 to 50 °C / -4 to 122 °F
• Optimum charging temperature: 20 to 22 °C / 68 to 72 °F (Room Temperature)

Combining intelligent adaptive lighting, industry-leading visibility, and premium Knog design, the Knog Cobber Reflex Rear Light delivers next-generation cycling safety for road, gravel, and urban riders alike.