The Sigma Ferrite Magnet is a sophisticated spoke magnet specially designed for speed measurement. It offers a reliable and accurate solution for cyclists who want to monitor their speed while riding. The magnet is compatible with various models in the Sigma BC series, making it a versatile choice for different bikes. Made in France, the Ferrite magnet is characterised by its robust construction and durability. The black colouring ensures unobtrusive integration into the bike design. This magnet is an essential component for anyone who wants to keep an eye on their performance.