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Sigma Performance Slipper clutches are competing at the top level in the 2025 Pirelli National Sportbike Championship

The Sigma Performance Racer Support scheme

Racing is about far more than power down the straights. Well-controlled high-speed corner entry is just as important to a quick lap as sheer grunt. The trouble is that big four strokes have a lot of engine braking, and that can really destabilise their rear suspension.