Is there a basic V-speed chart for the stock aircraft, such as rotation speed. I know the Garmins show Vx, Vy, etc.
Google would be a good start.
Very likely that aircraft manufacturers publish such charts.
Look for the POH (Pilot Operating Handbook) of the aircraft you want to fly. For most aircrafts this is freely available. The POH contains the V-speeds and much more. It would have been nice if the sim came bundled with the POHs, but sadly you have to look for it yourself.
For the Airbus A320 Familie you can calculate it here 
Thanks to all!
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