Hi, my unlisted coach is only 10 inches in size, but the Zwift has a minimum of 20 inches, so my speed is unrealistic. What should I do to make the speed realistic when the smaller wheel size cannot be set?
Hi Alešs,
Welcome to the Forums.
Is the 10-inch wheel that you mention a flywheel on your trainer? The wheel diameter setting in Zwift is designed for wheel-on trainers and the diameter of a real bicycle wheel.
Yes it’s a flywheel. 
Is there anything other solution, than to buy new trainer with a real bike wheel?
you are confusing real wheel size with the flywheel size, the flywheel size has no bearing on wheel size, what trainer are you using?
yes, i got it wrong. I’m a beginner and I don’t know much at all …
My trainer is - HouseFit Tiro 50