Safety and fun all rolled into one the cube kid 240 street girls bike 2017 is a 100 street safe kid39s mountain bike that39s as well suited to daily use as it is to trail ride fun extensive safety features including a dynamo powered lighting system provide the best possible safety out on the road the 21 speed gear system and suspension fork on the boys39 bikes provide the best function and the greatest possible comfort on longer rides the heat treated 6061 alumin