Guardian Bikes - Original Series - Safer Patented SureStop Brake System (As Seen on Shark Tank) SAFER PATENTED SURESTOP BRAKE SYSTEM: prevent head-over-handlebar accidents and allow kids to stop faster. The award-winning brake system is why EVANTUBEHD calls GUARDIAN "WORLD'S SAFEST KIDS BIKE" KIDS BIKE 20 INCH: boys bikes and girls bikes for heights 3'9'' to 4'5'' (approx ages 5-9). Rated as one of the BEST BIKES FOR KIDS by Two Wheeling Tots for 20 bikes. LIGHTWEIGHT KIDS BIKE: youth bikes at only 21.5 lbs means easier handling for better control and safety. INCLUDES: 6-speeds, kid specific easy reach lever, kickstand, double wall rims, NO TRAINING WHEELS NEEDED (learn more at our website) 99% ASSEMBLED: This kids bicycle ships 99% assembled with all the tools you need (&lt;10 min setup for you!)