Sigma

Sigma Bicycle Brake Light 3100

3.5 (67 reviews)

Stay Safe on the Road with Enhanced Visibility Introducing the Sigma Bicycle Brake Light - 3100, a simple yet effective solution for improving your safety while cycling. Designed for easy installation and long-lasting performance, this brake light ensures you're seen when it matters most. Ideal ...

$6.58*
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*Price sourced from Amazon.com. Last updated:Jul 15, 2026.Price and availability are subject to change.

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Overview

Stay Safe on the Road with Enhanced Visibility

Introducing the Sigma Bicycle Brake Light - 3100, a simple yet effective solution for improving your safety while cycling. Designed for easy installation and long-lasting performance, this brake light ensures you're seen when it matters most. Ideal for various types of bikes and riders.

  • Compatibility: Suitable for kids bikes, commuter bikes, and road bikes
  • Installation: Easily clips onto your brake cable with a 2.5mm hex wrench (not included)
  • Operation: Activates automatically when brakes are applied
  • Brake Type: Compatible with mechanical brakes, including most mechanical disc brakes
  • Battery Life: Capable of over 100,000 braking procedures on a single battery

Key Features

Easily clips onto onto your brake cable with a 2.5mm hex wrench, nothing to remove

Work with all mechanical brakes (including most mechanical disk brakes)

Great for kids bikes, commuter bikes, and road bikes

Battery lasts more than 100,000 braking procedures

Simple tap your brakes and the light turns on

Specifications

Installation Tool
2.5mm Hex Wrench
Brake Compatibility
All Mechanical Brakes (including most mechanical disk brakes)
Battery Life
More than 100,000 braking procedures
Activation
Automatic upon braking
Suitable For
Kids bikes, commuter bikes, and road bikes

Pros & Cons

👍 Pros

  • Battery is designed to last for over 100,000 braking procedures, offering extended use between replacements.
  • Installation is straightforward, requiring only a 2.5mm hex wrench and no removal of existing bike parts.
  • Compatible with all mechanical brake systems, including most mechanical disk brakes, ensuring broad applicability.
  • Provides an additional safety measure for diverse cyclists, from children to commuters and road bike enthusiasts.
  • The light activates automatically upon tapping the brakes, ensuring immediate visibility when decelerating.

👎 Cons

  • Requires a 2.5mm hex wrench for installation, which may not be a tool readily available to all users.
  • This brake light is only specified to work with mechanical brake systems, limiting its use on bikes with hydraulic brakes.
  • The product's functionality is limited to rear-facing visibility during braking, not offering continuous illumination.
  • Specific details on brightness or light patterns are not provided, making it difficult to assess its visibility in varying conditions.
  • There is no mention of water resistance or durability against elements like rain or road spray, which is a consideration for outdoor use.

Frequently Asked Questions

Installation of the Sigma Bicycle Brake Light 3100 only requires a 2.5mm hex wrench to clip it onto your brake cable. You do not need to remove any other parts of your bicycle.
The Sigma Bicycle Brake Light 3100 is specified to work with all mechanical brakes, including most mechanical disk brakes. It is not listed as compatible with hydraulic brake systems.
The battery for the Sigma Bicycle Brake Light 3100 is designed to last for more than 100,000 braking procedures, providing a long operational lifespan.
The light automatically turns on when you tap your brakes, providing immediate illumination to signal deceleration.
This brake light is well-suited for a variety of bicycles, including kids bikes, commuter bikes, and road bikes, due to its compatibility with mechanical brake systems.