The back tire is damaged. The perp runs up on her and knocks her off. He gets out and is all "I'm sorry" and seems real nice. He says "I'll bring you anywhere you need to go, let's load up your bicycle." She agrees, and that's that. That's why nobody heard anything, there was no struggle, no mace. She went willingly.
That is not exactly the picture I've got visualized. This is due to many indicators; abduction of the victim, 2 am time of abduction on a virtual deserted street, dumping the bicycle 30 miles away, rermoving the handle bar grips, cleaning the crime scene, 10 days missing, etc.
IMO, Mickey's abduction was not to cover up an accident, but was by an experienced predator cruising the area for an opportunist victim.