Read more: 12 Major Motorcycle Brands Ranked Worst To Best Arguably one of the most influential motorcycles in the brand's back catalog, the Harley-Davidson EL Knucklehead was introduced in 1936.

The EL Knucklehead Is The Original Road Brat In Harley-Davidson's earlier years, not every motorcycle it produced got a proper name. It's not like today, where every series and model has a unique ...