Thanks for your advice. I am going to check my wheels also. I don' t use the Cara as much as you do. But last year I drove the 3000km Liege Brescia Liege rally. Perhaps this caused some damage to the studs too.
I keep you informed what I find.
1968 Suzuki Fronte LC50, 1984 Suzuki Coupe SC10GX, 1987 Suzuki Alto Works RSR, 1994 Suzuki Cara, 1995 Suzuki Cappuccino EA11, Suzuki Swift SA130 Mk1 Cabrio prototype