Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Sportbike PRO kit Free.
Sportbike PRO kit v1.5
This is sportbike PRO kit for making your own motorcycle game !
Mobile version included.
This is most realistic two wheel physics with any kind of bikes, wheelie, stoppie, two independent brakes, real suspension work, lowsides, highsides, ESP/ABS, IK head “look at”, reverse and pilot mass moving.
Try here WEB playable version
WebGL playable version(buggy shadows)
The package three bikes and riders, few scripts and full documentation how to tweak it for any kind of and your model assets.