The Pitbull is a pretty strong animal and has a pretty strong biting force however the Pitbull is a weakling when it comes to a Wolf or a Pitbull.
If a Pitbull and a Wolf got into a fight the Wolf would be the one to win the fight because a wolves bite is stronger than a Pitbulls.
It would take around 5 or 6 Pitbulls to fight off and win the fight against 1 Wolf.
It's been shown in several studies that a Wolves Bite Force is much higher and stronger than a Pitbulls bite force even though Pitbulls also have a strong biting force and can really clamp down on another animal or human.
If a wolf and pitbull dog get into a fight the pitbull is likely to be killed or injured severely and you should never try to break up a fight between a Pitbull and Wolf or a Pitbull and anything else.