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So I have decided to dust off my Arion Digital Smart B+ which I never really got to grips with before.

I've paired it with my Garmin 820 to use it as an FE-C unit, I could use the my E-training app but I don't have a bluetooth HR monitor at the moment.

The issue is that the speed on the Garmin is reporting crazy high, like 120mph high.

I've tried setting the wheel circumference on the Garmin to 0, 67mm (drum circumference /4 as found online) 2105mm (which is the whole circumference)

I've also tried disabling the Garmin speed sensor and tried adjusting the wheel circumference setting on there to 0, 67 and 2105mm too

None of these work to set the wheel speed correctly.

Where am I going wrong?

Hi

If you're connected as fe-c trainer, the circumference value is ignored (in theory).
If you use my e-training, do you have correct speed?

When using the my e-training, the speed is reported correctly

So, the problem must be on the Garmin setting.
Did you try contacting Garmin Customer care?