Vehicle suspension systems

1. A driven wheel suspension system comprising a chassis having a driving coq rotation axis, an upper carrier manipulation link pivotally connected to the chassis at a fixed upper pivot, a swinging wheel carrier link pivotally connected to said upper carrier manipulation link at an upper link floating pivot, a lower carrier manipulation link pivotally connected to the swinging wheel carrier link at a lower link floating pivot, said lower carrier manipulation link being pivotally connected to the chassis at a lower link fixed pivot, wherein said lower link fixed pivot is above the driving cog rotation axis, and wherein said suspension system has a squat curve with a negative slope in the beginning of suspension travel and in the end of suspension travel, and wherein the slopes in the beginning of suspension travel and in the end of suspension travel are more negative than the slope of the squat curve in the interim of suspension travel, and wherein said squat curve is obtained by determining a measured squat distance at various percentages of suspension compression, said measured squat distance being determined by an intersection point of a squat force vector and a squat layout line, said squat force vector also intersecting with an intersection point of a chain force vector and a driving force vector and said squat force vector also intersecting with a drive wheel ground contact.