Hi Tom,
I have good news and bad. I'll start with the bad. While cutting using the standard profile it was offset by about 6mm when trying to round the edges. It appeared to measure the width of the tyre correctly. I would post a picture but am not currently allowed. Basically the cutter moves in thin air at one side of the tyre then adds 6mm worth of grooves in the other. I have emailed them about this but not heard back yet.
The good news is the carbide bit is included and gives a nice smooth surface to the tyre with the finished diameter being 0.4mm larger than the programmed value. This was done using the special mode where the cutting bit is moved to the 2 edges of the tyre to determine the width.
I tried measuring a striped tyre automatically and had no issue. I'll report back when i have heard back from SMART.

Cheers, mike