your both wrong, 25 mm is 1 inch, so 7 inches is 175 mm
Actualy if you want to be anal about it 7" = 177.8mm. And just to clear things up if your going to tell someone they are wrong you should at least try to back it up with proper information.
And since we are being anal about measurements, the drop off triple has 170mm of travel which by most acounts is good enough to be called 7" but its really only 6.69" rounding down of course.