The generator hub we use on our own bikes! The Delux Wide-Body features extra-wide flange spacing (68 mm vs. 50 mm on the standard SONdelux) for a much stronger wheel. This hub is strong enough for off-road racing and even tandems. The internals are the same as all SONdelux generator hubs: lightweight and with ultra-low resistance. SON's unique pressure compensation system eliminates problems with water getting into the bearings as the large volume of the hub body warms and cools.