Looks like the original has dissapeared...
The site that I thought I got it from doesn't seem to have it anymore, and because its a non-english site and has had a big redesign I couldn't find whether it had just been moved somewhere else or not....(or even if it was the right site) so I've uploaded a copy to my own homepage:
http://homepages.igrin.co.nz/simon/imag ... height.jpg
By the way none of the tyre sizes in the table match either my old tyres (185/65/15) or new ones (205/60/15) but I found the figures in the bottom column matched the figures calculated from the Citroen service manual the best. (Their method gives figures that allow you to take variations in tyre rolling radius into account accurately)
This simplified diagram (I think it originates in the Haynes manual) is not applicable to the V6 or Activa, but is close enough for most other models.
Regards,
Simon