Repent is changing your direction. Remorse (Is less important)/contrite (Of sinful deeds), however creates harmony towards others so that they may genuinely forgive as commanded. Giving the bike back would be a good start.
Where it’s possible that “can” be a good start. However you still borrowed it without permission and how do you erase that? You can’t give the borrowing back too. History is indelible.
This is where we realize we too are debtors to the grace of God. We can refuse it, but we can’t force it to occur either. When it occurs it is because God willed it, and we would be foolish to refuse it when God does.
Ultimately, repent is the only thing actually required by the Lord. We’d never be able to personally undo all the stealing of grace we stole away from other people, something that actually matters more than a bike, though in our materialistic system we get it upside down. But the Lord by furnishing new grace can make it possible to reverse this course in the world.
There was a legal case a few years ago where the USSC upheld the reclamation of funds that had been donated to the Salvation Army after being defrauded. I asked a knowledgeable friend about this, whether this meant the defrauded funds would be returned to those who were defrauded. Oddly enough the answer was no. They’ll go to another charity....
BTW, the instance of Zaccheus is interesting. He pledged, out of the wonder of salvation that he had accepted from the Lord, to better than make whom he had cheated financially whole.
That can literally be done sometimes. Presumably Zaccheus had also prospered in more honest ways — which the Lord had previously willed would occur — and this prosperity was now being shared with those who had been cheated.
An even more important thing is to share a multiplied share of grace with those willing to receive it and whom you had stolen grace from in the past. (One does not, however, bestow pearls upon pigs.) This is to live out a picture of the Lord.
No, remorse is just feeling bad about it.
Repentance is changing enough to do something about it.