This is the depth of the foam insert. As you can see in the background the wheel does stick up from the base foam a little bit.

But there is 1.5 inches of foam in the top of the case to hold the radio in place.

You can see the part of the foam my wheel contacts as that bump is compressed. If you really wanted it to fit perfectly you could trim the bump off with body scissors.

It's a tight fit but I have never felt like it is damaging to my radio.