A: Because, apparently, the year 2100's hoverbikes don't have a built-in chrono-sync feature.
Read more about TimeTraveling With WatchesA: They're just fancy time-reversal gadgets. Don't ask questions, just use them.
Learn more about Chrono-SplintersA: No. That's just a recipe for catastrophe. Stick to the official TimeTravel Inc. toaster.
A: Take some Temporal Displacement Gummies. They're available over the counter at any decent time-travel clinic.
Read more about Temporal Displacement Treatments