io ho preso questo
http://www.gmmoto.com/product_info.php?products_id=313{12}153
questo
http://www.gmmoto.com/product_info.php?products_id=121{8}18
e questo
http://www.gmmoto.com/product_info.php?products_id=106 ma non ho capito la differenza fra frizione special e frizione strong