I think my point was more to do with the fact that the French moved to 600 2 or 3 years earlier than the Americans did. I know the American grand record moved to 600 for instance in the early 80's. D you not think quality was an issue too though? Especially after being stuck with the centre pull weinmann for so long? I do not know if the French models moved to 600 in 1977 though, I only know my bike has them and it is 1977, the Americans started using it much later. I think/ hope someone will correct my absolute ignorance