they look pants but weigh feck all.
Quite a few of the r's imported into the uk have lightweight 15"s on them. and cause they are all mulitcoloured, most people sell them. so if you post in the buying and selling section, someone might have a set in the garage.
alternativly, the light weight racing version of the superlegera, weighs about 5kgs in 15" and that is nothing at all.. hope this helps.