The FAA requirement for light aircraft is that the maximum demonstrated crosswind is 20% of Vso.
Some manufacturers don't bother to go beyond this requirement, even though the aircraft is capable of managing higher crosswind components.
For example, the DG1000 glider has a ridiculously low maximum demonstrated crosswind component of 8 kts, which is 20% of the gross weight Vso. However, the manual then states "Strong crosswind offers no problem", without defining "strong"!
There is an interesting older discussion on this topic:
http://www.pprune.org/tech-log/38029...on-please.html