Absolute rubbish. The only BRCA rule regarding dimensions is:
23.7 Wheels and tyres must conform as follows:-
No form of metal or plastic spike, tubes or anything similar will be attached to the tyres. Maximum diameter allowed is 90mm front and rear. Only commercially available wheels and tyres may be used.
There is no rule to prevent anyone running a 3" wheel, as long as it is commercially available and the tyre doesn't exceed 90mm overall diameter.
The only argument you can use to ban any manufacturers wheel is if it is not commercially available in the UK.
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