I tried my rollers with a Dawes Lightning and was able to ride..OK.
I sold my Dawes so I decided to try my Trek MTB on them.
The tires were kinda low. I started spinning and in short time caught myself before falling to the ground.
Going to give it another go after I air up the tires and move the front roller to the last mounting spot. I'm sure something better than knobby tires would roll better.

Reference pics only. The rollers are usually out back on our patio area.