sentences:  Beyond inline hockey, the Hi-Lo setup was an experimental component seen on K2's VO2 100 X Pro where the manufacturers believed that the two smaller wheels ( each) in front would increase stability and rate of acceleration while the two bigger wheels ( each) in the back would maintain high speeds.Essentially this K2 skate model married both wheel size properties.A Hi-Lo configuration on an inline speed skate employs three large sized wheels and a smaller sized wheel between the first and third wheels beneath the ball part of the foot (see speed skates).