KTM never should have given Husky the keys to the R&D closet. In any household, siblings have to get used to sharing, but having access to KTM's resources has completely transformed Husqvarna's dual-sport machines. The thumping single-cam heart of the 501 S comes straight out of the knobby-shredding 500 EXC. Although these two brothers are very similar, the different chassis and suspension components, including the 4CS WP fork and linked shock, allowed Husky to outperform the competition in our April 500cc dual-sport comparison. Combine the powerhouse engine with incredible handling and trail compliance, and you have the best dual-sport machine we've ridden.