Agressive skates frames are UFS (Universal Frame Système) they fit all agressive boots that have this mounting system.
It you want do know more about differences of the frames and utility, we have a page to explain to you... click there.
Youth frames are back in black, and more solid.
All in one, let's ride them as you want, freestyle, flat or antirocker...
KALTIK Freestyle frames for inline skates
KALTIK Flat S. Swain Frames