The 19-year-old was riding along the pavement when the pair followed him down an alleyway and attacked him.
Doctors said the youngster was lucky to survive after he suffered near fatal wounds to his jugular vein. He has since been discharged from hospital. CCTV footage released today from the alleyway shows the suspects as they run after the victim. The vicious assault happened in Hackney, east London, on December 5 last year.