What you have here is a classic example of manufacturer trying to be clever and it biting them. They now have a rim that only their tyre fits and a range of tyres that only fits their rim.
The buggy manufacturers, just like F1 and other full-sized racing, use the tyre as part of the suspension. Going low-profile isn't the way to go.
They have tried to use the maximum diameter including the rims as the diameter to which the tyres are ruled - a 5.59mm difference. Then they have the internal rims which make the wheel even larger than the maximum 61.47mm. There is an engineering drawing in the Ifmar rules 4.2.11 (page 14) which makes it clear.
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