Compound: S91F

Description

S91F is a semi-metallic rear brake compound developed primarily for rally cars, with a braking character designed to build friction at a moderate rate so that hard braking does not easily trigger rear lock-up. This controlled friction development helps maintain rear stability and gives the driver a more predictable and manageable brake balance under demanding competition conditions. Its performance profile makes it especially well suited to rear-axle use in rally applications, where stability under heavy braking is critical, while also making it suitable for light racing cars and single-seater applications up to Formula 3 level. With its balanced response, reduced lock-up tendency, and clear rear-focused role, S91F is positioned as a specialist compound for competition use where controlled rear braking and stable vehicle behavior are essential.

Specifications