Knowledge Centre
Expert Harley-Davidson guides, technical information and history from the specialists at Steel & Speed. Our Knowledge Centre is designed to help riders understand different Harley models, identify genuine OEM parts and make informed decisions when maintaining, repairing or restoring their motorcycles.
Harley-Davidson Model Families
From the legendary 1941 FL to today's Pan America adventure motorcycles, Harley-Davidson has developed a range of model families, each with its own purpose, engineering philosophy and riding experience. Whether designed for long-distance touring, everyday cruising, performance riding or adventure travel, every Harley-Davidson family has played an important role in the company's history.
Our guide explores how these motorcycles evolved over the decades, what makes each family unique, and how understanding the different model ranges can help you identify the correct motorcycle, and the right genuine OEM parts.
Harley-Davidson Engine Evolution
From the early Flathead engines of the 1900s to today's Revolution Max platform, Harley-Davidson has continually evolved its V-twin engines while preserving the distinctive character that defines the brand. Each generation introduced new engineering, improved performance and shaped the motorcycles that followed.
Our comprehensive guide explores every major Harley-Davidson engine family, including the Knucklehead, Panhead, Shovelhead, Evolution, Twin Cam, Revolution, Milwaukee-Eight and Revolution Max. Learn why each engine was developed, how it rides, the motorcycles it powered, and what makes every generation unique.
Whether you're restoring a vintage classic, maintaining a modern touring bike or simply interested in Harley-Davidson history, this guide provides an in-depth look at more than a century of Harley-Davidson engine development.
Harley-Davidson 32534-11 ECM Obsolescence: Symptoms, Solutions, and the Aftermarket Rescue
Harley-Davidson ECM part number 32534-11 was the factory replacement module for numerous fuel-injected Sportster, Dyna, Softail, Touring and V-Rod models. With this ECM now discontinued, owners are increasingly searching for reliable replacement solutions.
Our guide explains the most common failure symptoms, the Harley-Davidson part numbers it superseded, and the replacement options available today, including the highly regarded ThunderMax ECM.