A 900-pound bear vs a 100-pound wolf. The wolf is prey, not a competitor.
In the wild, gray wolves and grizzly bears share territory and interact regularly. Individual wolves give bears an extremely wide berth. Wolf packs can sometimes drive a bear away from food, but a single wolf confronting a grizzly is suicidal.
The grizzly outweighs the wolf roughly 9:1. Its paw swipe can crush the wolf's skull in one blow. The wolf's 400 PSI bite can't penetrate the bear's thick fat and fur effectively.
The wolf is faster and more agile. But solo, it has no viable attack strategy against something 9x its weight.
9:1 weight advantage. Devastating paw swipe. Thick protective fur and fat. The grizzly would barely register the wolf as a threat.
The grizzly wins overwhelmingly. Solo wolves simply don't fight bears โ they run.
Gray Wolf also fights
Grizzly Bear also fights