Hi John,
I think that in French law, the mudguards are mandatory, but in reality the police are quite tolerant with the MTW because it is an atypical car, moreover the MTW is not classified as an automobile but as a tricycle Like a Can-am or a Piaggio mp3 scooter, the consequence is that there is no technical control or tax pollution.
concerning the reference of the tires, it is written on the sides: Michelin Harley Davidson 120/70ZR19 Scorcher "11"