Dog is afraid of anything on wheels.

I have an 11 month old Labradoodle named Gemma that is fearful of anything on wheels (expect cars). Admittedly she could be more socialized with dogs and people (she really really really wants to play and it can be an issue) but when we're on walks she's very perturbed by bikes, scooters, triciles, even wheelchairs.

Luckily she shys away from wheels instead of charging them but I'm worried about it getting worse. We're currently working on training her in the back yard with our own bikes and scooters but even with her owners in a controlled environment she gets really freaked out.

This is seriously the quickest learning dog I've ever had but this one issue seems deeply rooted.

Any advise?