The Philcentric is an Outboard Bottom Bracket that gives you eccentricity without using horizontal dropouts, an eccentric hub, or chain tensioners. *You may be required to use a half link.<br /><br />These cups will fit a 24mm spindle, but Philwood makes an adaptor that enables one to use a standard Philcentric cup with Truvativ and SRAM cranks. At this time Campagnolo cranks are not currently compatible. Campagnolo uses a center bearing on their crankset that interferes with our bottom bracket.<br /><br />Philcentric outboard bottom bracket cups include Standard Dust Covers (medium sold separately)<br /><br />All Philcentric outboard bottom bracket cups require the Phil Wood Philcentric installation tool.<br /><br />*Please call for Italian threaded cups<br /><br /><strong></strong><strong>COVER COMPATIBLITY</strong><br /><strong>Standard Cover</strong> (included): replacement dust cover for Race Face, FSA and pre-2006 Shimano external bottom brackets (24x37x8).<br /><strong>Medium Cover</strong> (sold separately): required for 2006+ Shimano external bottom brackets with #6805 bearing (25x37x7).