Sigma

Sigma Spoke Power Magnet - Black

Name: Sigma Spoke Power Magnet - Black
Brand: Sigma

★★★★★4.5 (279 reviews)

Sigma spoke magnet provides reliable speed and distance data for Sigma cycling computers with a simple, tool-free installation.

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Overview

The Sigma Spoke Power Magnet is a small but essential accessory for cyclists using Sigma Sport cycling computers. Its sole function is to attach to a wheel spoke and pass by a fork-mounted sensor with each revolution, generating the magnetic pulse that allows your computer to calculate speed, distance, and related metrics. The snap-on design makes installation quick and straightforward — simply clip it onto a spoke, align it with your sensor, and you are ready to ride.

Built from durable materials in a compact black housing, the magnet is designed to stay firmly in place through road vibration, wet conditions, and regular use. It is an ideal replacement if your original spoke magnet has gone missing or broken, and a sensible spare to keep in your toolkit for long tours or events where losing sensor connectivity mid-ride would be frustrating.

Key Features

High-strength spoke magnet.

For all Sigma Sport computers, tool-free fitting.

Compatible with both round & bladed spokes.

Specifications

Brand

Sigma

Function

Spoke-mounted magnet for cycling computer speed sensor

Color

Black

Installation

Clip-on (tool-free)

Pros & Cons

👍 Pros

Lightweight and compact design adds virtually no weight to the wheel.
Tool-free installation clips directly onto a spoke in seconds.
Durable construction withstands vibration, rain, and regular riding conditions.
Provides consistent magnetic signal for accurate speed and distance readings.

👎 Cons

Only useful as a replacement or spare part — serves no standalone function without a compatible cycling computer and sensor.
Must be precisely aligned with the fork-mounted sensor to register reliably.
Limited to wheel-based speed measurement, which cannot account for tire wear or pressure changes affecting accuracy.
No included instructions for optimal spoke placement or sensor gap distance.

Frequently Asked Questions

What Sigma cycling computers is this spoke magnet compatible with?

The Sigma Spoke Power Magnet is designed to work with Sigma Sport cycling computers that use a magnetic sensor for speed or cadence detection.

How does this magnet attach to the wheel?

It clips directly onto a spoke without requiring tools, using a secure snap-on design that grips the spoke firmly during rides.

Does this magnet measure actual pedaling power in watts?

No, despite the name "Power Magnet," this is a spoke-mounted magnet used by the sensor to detect wheel rotations for speed and distance calculations, not a power meter.

Can this magnet be used with non-Sigma cycling computers?

It is designed for Sigma systems, but any cycling computer that relies on a spoke-mounted magnet passing a fork-mounted sensor may work, provided the magnet's size and strength are compatible.