Chicago Skates 2 in 1 Training Skate Combo Set: Adjust to grow with your child. Stage 1 the skate starts out in a three wheel position, much like training wheels. Once the child advances their skills the two training wheels are moved to the inside of the chassis, converting to an inline skate. These sets include everything a kid needs to safely skate; helmet, wrist guards and knee pads. Offered in a backpack combo set (CRS500/ CRS505) or a boxed set (CRS520/CRS525). Available in adjustable sizes: S (J10-J13), M (1-4).