A teenager hijacked a police car during a chase before driving at 113mph in a 30mph zone - but was eventually tracked down by a police dog.
Dafydd Williams had racially abused a garage owner before striking him with a crowbar prior to the pursuit, a court heard.
The 19-year-old thug had demanded Rebin Abdulla Ibrahim change a tyre on his friend's red Citroen C3 Picasso while brandishing the weapon.
