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: Yamaha SR500 1978-1982 XJ650 1980-1982 XS1100 1978-1981 XS1100R 1981 XS250 1978-1981 XS360 1976-1977 XS400 1978-1979 XS650 1968-1985 XS650S 1979-1981 XS750 1977-1979 XS750SE 1979 XS850 1978-1983 XV1000R 1981-1982