Ducati Sporting Club UK > DesmoDue Race Series > DesmoDue - General Questions and Chat > Where did our race number sizes come from

[skidlids]

As the title says
Where did our race number sizes come from

ACU hand book says minimum of 140mm high both front and sides yet DD rules say 160mm high front and 120mm high for the sides,
not a worry for me as my numbers are a bit on the large size.