Your little ripper has moved on from training wheels and needs a bike that's ready to grow with him, and you want him to have something that will be at home on backyard obstacle courses and family bike path rides alike. GT's Aggressor 20in Kids' Bike will give him the confidence he needs to continue to hone his skills on a variety of terrain, with solid components on a frame that wants to go fast.GT constructs the frame of the Aggressor with 6061 T6 aluminum, which is a treated version of the metal with a blend of low weight and strength that won't weigh him down as he tackles challenging new terrain. Overall, the bike's geometry is upright, which keeps the bike easy to control and helps young riders exercising their independence stay aware of what's going on around them. GT also adapts its signature Triple Triangle design for youth riders on the Aggressor, providing them with their own version of a smaller rear triangle with reinforced seatstays to help the bike feel snappy as they race around the neighborhood.GT includes an All Terra triple crankset on the Aggressor paired with a Sunrace 7 speed cassette, which opens up a whole new range of gear ratios for kids used to single speed bikes to explore. And as they get more confident and become comfortable at higher speeds, linear pull brakes will provide consistent, reliable stopping power when they need it.