The S3 sintered compound is optimal for street bikes, dual sport, touring, cruisers. It's recommended on applications with rather larger engines or for people who ride harder than average and want the great stopping power of a sintered brake pad. Fits: Harley Davidson FLH 1340 ELECTRA GLIDE 1982-1983 FLH 1340 HERITAGE 1981 FLHC 1340 ELECTRA GLIDE CLASSIC 1982 FLT 1340 80 CLASSIC 1981 FLT 1340 TOUR GLIDE 1979-1983 XLCH 1000 SPORTSTER 1973-1979 1981 XLCH 883 SPORTSTER 1975-1977 XLH 1000 SPORTSTER 1973-1982 XLH 883 SPORTSTER 1973-1981 XLH SPORTSTER SUPER 1973-1981 XLS 1000 ROADSTER 1979-1982