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Are you just wanting the background without the bike?
I think your best bet is to just use the clone stamp and work over the bike using an aligned sample. You can also try selecting sections of it, then use Edit/ Fill/ Select Content aware. May be another way, though. I'm sure is there is some of my more learned Gurus will enlighten you/me.
Maybe this will help you. This is a jpg though, not png.
View attachment 34259