OK I recall this being shown in the UK after school. It may be Grange Hill or Byker Grove. I believe it centred around kids. What I distinctly remember is several scenes taking place in a parking garage where the kids interact with a guy on a motorbike but the visor is always down on the helmet so his face is never seen (at least in the scenes I recall). I may be wrong but I believe he was a villain and the kids were intimidated by him. I think he led a gang as well.