It has been proven that the triangle is one of the strongest structures for support as can be evidenced by looking at almost any bridge, rail road trestle or skyscraper frame.
The Durfee Girder like all true girders gets a lot of its strength from its triangular design. Many others besides Indian used the girder design, in fact a lot of the other American and most of the European motorcycle manufacturers of that period used girders in their production motorcycles. Imagine extreme heat, no roads, blowing dust and sand, hills, valleys and craters that could swallow a tank and you start to get the picture of how rugged these front ends were and how good they can be today with advances in materials and processes unknown 70 years ago. Army while out chasing Rommell and gang in the Sahara Desert during World War II. The Durfee Girder is actually based on the girders used on the Indian motorcycles of the 1930's and 40's which were a good design, being rugged enough to be used by the U.S. This may or may not be true because if designed properly, a Girder offers some benefits that a Glide or Springer can't - yet gives outstanding performance and great looks, which is what most bike builders seek in the first place. The glide is currently the most popular, to the point of being boring and is sometimes thought to be the best performer of the three. These three are the most commonly used by custom bike builders, because they are proven designs offering good looks and performance for road handling. When selecting a custom front end for your next project, there are three main styles to choose from, the Glide or Hydraulic, the Springer, and the Girder. Most people think that a girder front end is for looks only, and does not help in making the bike handle. Some may not know much about them, so figured I'd add a copy/paste from the old Durfee site about "Why a Girder".
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