I'm sorry that this series will soon be coming to an end.
There's a problem of the Ship of Theseus (or of George Washington's axe) here. What parts can be changed with the bike remaining the same bike? I'm inclined to see the frame as one irreplaceable part; others might think that an engine block were that (though a motorbike is a motorized bike). So, in Reiko's position, I'd set that frame aside until it were practical to repair it, unless there were no expectation that such a repair would be possible.