Tyre Scuffing Visual Effect | iRacing

“A tire rubber scuffing shader visual effect has been added to all cars. This effect is tracked locally across the width of the tire and will dull the “new tire” sheen through use. As tires continue to run on the track, highly cambered tires will appear rough in areas that touch the racing surface and remain shiny in areas that are raised.“ - iRacing 2022 Season 1 Release Notes