In my old PC (pentium 1gb-winXP-128Mb graphicstuff) GP3 only suffers to ride on starts of races and all the graphic works fine and appears fine and correct too.
In my notebook ( coreduo 3gb-winVista) GP3 flies, but the graphic card dont wok correctly on tyres( the pink trouble).
So I done a new bmp image only to play GP3 in my notabook with a modified version of the same tyres bmps used on my old PC.
i think it is the same solution used in that pink tyre bug threath in the graphics section .