using 25c tires

 Is there a setting that we can set if were using 25c tires or the program only able to calculate with 700x23 tires?

Right now Zwift is only compatible with 700.

Are you using a speed and cadence sensor on a “dumb” trainer or are you using a power meter on “dumb” trainer?

 

I’m assuming when you said comparable with 700 you mean 700x23? I’m using a speed and cadence sensor on a dumb trainer (Cycleops Fluid2)

Your watts is going to be translated a little high within Zwift.

There is not much difference between 700x23 and 700x25 to make a difference in Zwift.