I just started with trainer road and I’m currently using an old mountain bike with my trainer and virtual power and would like to use my road bike instead. Do I need to do another ramp test and re-start the program or should I just swap and continue? Or is there something else?
Hey there!
With Virtual Power, the type of tire you are using has a huge effect on the virtual power readings. Mountain bike tires roll much slower than slick and narrow road tires, so you need to generate more power at the same speed.
Since VP measures speed to extrapolate your power output, this is a problem.
There’s no need to restart the program upon retesting, just substitute one of your scheduled rides for a ramp test, and then carry on with your training at your re-calibrated FTP 
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Thanks, that answers my question!
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