EX 511 Developed for the fastest EWS riders ? the widest 30 mm welded Enduro rim. Enduro may still be a young discipline, but at its core it's about the rider's inner desire to ride challenging terrain faster and faster. In fact, it's what mountain biking has always been about. And the EX 511 is exactly the right rim for this: it has the technology that has already delivered numerous EWS victories and packs it into a 30 mm wide profile. Then you're ready to go!