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: Buell XB12 X XT Ulysses 2006-2010 XB12 XT 2009-2010 XB12R Firebolt 2004-2008 XB12S Lightning 2004-2008 XB12STT 1200 LIGHTNING SUPER TT 2007 XB12X FX ULYSSES 2006-2010 XB9R Firebolt 2002-2007 XB9S Lightning 2003-2004 XB9SX LIGHTNING CITY X 2005-2010