Doesn't quite go well with my 15" trailer tires but works quite well as a deterrent. It also works very well as a wedge on soft or rough surfaces. Don't think it will work as well on a smooth surface as the tooth plate cannot cut into anything. I like that it has a plastic cover for the locking mechanism that is supposed to keep snow and rain out. The recommended tire sizes and the Trimax TCL75 Wheel Chock Lock are listed on the packaging. Too bad they don't list it in the Amazon description, it would help everyone a lot. Yes, you can take my bike off, replace it with a spare and drive away. But if a thief wants my trailer so badly, he'll pick almost any lock. I wouldn't use this for anything really expensive, but it works for my needs.