To manage the heat created by a motorcycle engine, engineers have two basic options – air cooling or liquid cooling. Each method has a number of advantages and disadvantages, and Harley-Davidson currently offers both air-cooled and liquid-cooled engines on its lineup of motorcycles. To find out why, let’s compare air-cooled and liquid-cooled engines. Motorcycle Heat Sources

The 50 Rides, One Nation Challenge is a curated list of great rides, one per state, that offers H.O.G. members a chance to experience some of the best riding destinations our country has to offer. The concept is simple: ride to the designated location in each state, document the visit with a photograph, and submit it to H.O.G. member profile to receive credit. In addition to collecting great memories and other rewards, participants also receive a unique challenge coin to commemorate each location visited. There’s no time limit for completion.