It is a great book, but people being people, printed errors and considering what has happened around the world in numerous museums ...& in this particular case of the Dva having mixed wheels...who could say for sure without secondary confirmation.
Despite not having seen procters tyres Im guessing that they were inspired by the NASM rebuild? Theres many a photo of Albatros that shows no 'shadow or sign of the bolt heads. Ive spent a few years trying to chase down half truths regards the dva. Id love to know to sure myself.
chris