I use this with 17" wheels with 35" tires and 12.5" width on my off-road trailer. Works great as bike chalk and as a theft deterrent. Let's be honest, if someone wants your trailer, they will find a way to get it. My only complaint and reason for 4 stars is where the keyhole is. When I tighten it and use it as wheel chalk, it points at an angle to the ground, making it a bit difficult to unlock. In addition, locks or wheels with a protective ring do not allow the use of this product.