
If the chase instinct is in a Border Collie there is nothing you can do to stop it. That said, you have to find a way to control it which suits your dog.
On my own personal experiece, I tried very hard to distract but the insinct was too strong. So I have had to control it so that she doesn't cause an accident or have one, the 'immediate down' was the solution.
It doesn't stop the fixation, but it does control the dog while you go and put the lead on. Obviously this needs to be taught so she is 100% reliable before you go near any bikes etc. Don't try and stop her in the down when she is in the chase while you are training this, or you will undo everything you have taught her if she disobeys.
When teaching this 'down' never call her from it, always go up to her calmly, no fuss, just quiet praise. Remember this is an order NOT a request, it might save her life one day.
If your are going to training classes ask your trainer to show you how to teach it as I find it depends on the dog on which method I choose.
Good Luck
Sandra