I am a little unsure from your post if this behavior is occuring on or off lead. If she is off lead, then I would suggest not taking her out off lead until she has a reliable recall in various situations. Keep her on lead, give the come command and treat or praise. When she is reliable at that wait until she is interested in something else (say sniffing a particular spot) call her to come then treat/praise. This can be done on a long lead, so you can correct if she does not come. Vary the situations when you call her to you, so she learns that responding to you is better than whatever she was doing before. If you are talking about her trying to chase a bike while on lead, what I would do is teach her what I want her to do or how I want her to behave, before she shows the unwanted behavior. For example, you see a bike coming down the street, before it even gets close enough for her to start pulling to try to chase it, you stand in front of her and tell her sit. You keep her attention and keep her in a sit until the bike goes by, you treat/praise/reward. It will take a several times to get her to stay seated quietly while the bike goes by. But rather than concentrating on the unwanted behavior (bike chasing) your are concentrating on the wanted behavior (sitting politely). You just must be awasre of your surroundings so that you can show her how to behave before the bike gets within chase distance. That would be my suggestion, but I am sure that there will be some other good or better ideas on here.