Checked a similiar problem that I have that someone wrote to EA. The Answer is following-->
EA.com wrote:Unfortunately, not all graphic details are available for all video cards due to hardware limitations. If an option is greyed out it is because the video card does not support it. The GeForce4 MX series of Video Cards are known Not to support Headlights, Motion Blur or Crowds, other video cards may or may not support all features.
Strange that, that other bike game worked
Anyway, looks like I have to update my graphic card
Any suggestions what I should buy. I don't need any new fancy shit, just an average card that support the blur motion effect.
Looked at this card named "ASUS Grafikkort V9520VS AGP 128Mb", anyway it was quite cheap.