I believe that the conflicting stories of the effect of rear track changes is due to the two conflicting effects that occur. When the rear track is reduced, rear grip is lost due to the reduced roll resistance, but at the same time increased due to the reduced differential effect. These two effects manifest themselves at different points in the cornering process. When accelerating out of a corner, the rearward weight transfer means both rear tyres are in contact with the track, and so grip is increased by reducing the differential effect between them by reducing the rear track. When turning in to a corner, only the outside wheel is on the ground, so grip is increased by minimising both the inner wheel lift and outer wheel positive camber by widening the rear track.
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