So, there are 2 pairs of Black Crows Captis skis at my house, 178 and 184. I took some measurements and this is what I came up with:
178 length: measured length tip to tail: 176.5; contact length: 151
184 length: measured length tip to tail: 183; contact length 153
For comparison, my ID Ones, at 176, which feel perfect and so well-balanced, are 174 tip to tail, and 155cm contact length.
Hmmmmm.
Also check out any differences in thickness and stiffness between the 2. Sometimes the longer lengths are not just longer...