In reply to steveriley:
No, the cam companies all seem to have come up with a different numbering system, which was fine as you could just use the 'standard' WC system as a baseline, but now wild country have inexplicably decided to change their system with their new cams.
An old friend 2.5 is probably about the size of the new wild country gold cam which is now called a Friend 2. You want the next size up (which used to be a friend 3).
The next one up is the purple one which they do call friend 3 (and is actually fairly similar in size to a friend 3) - but they don't now make a 2.5.
The comparison chart posted above is useful but bear in mind that it uses the wild country helium cam sizes (which are the old WC sizes you are used to) and *NOT* the new wild country cam sizes.
Confused yet?
Post edited at 11:10