Nogaro 635

I've noticed that my 635 has 240/ 45 tyres on the original multi spoke ( one piece) rims yet the spare in the boot has a 200/ 60 on it which I think is the original size The tyre size guide in the book list many combinations for te 15 inch wheels any thoughts as to what the car is best suited to? It would seem someone changes the tyre sizes for the M635 judging by what the book says. I've only done 150 miles since I Bought the car and the ride doesn't seem harsh on the 45 's - I will need to change the tyres soon and was wondering what is best? Also I'm told the rim size means one has to fit metric tyres? - can someone explain how these are different? many thanks Nogaro

Have had the car a month now and I'm told the rear teeth on the ABS ring are worn. I understand that on the 635 you cannot buy the rings separately but you have to buy the half shaft that comes with the ring at circa £100 each side ? Can anyone confirm? - mines a 1989 car so one of the last made so getting any from a "breaking car" would mean they are likely to be just as worn ? or can they be reconditioned? Any comments would be appreciated. - other than that the car runs perfect.