That tube is stiffer than the built up box section aluminum 11E swingarm?!?
Chrome moly is the abbreviation for "chromium molybdenum", and it is an alloy steel. It was designed for and is used extensively in the aircraft industry due to it's high tensile strength and torsional load ratings.
Because of it's higher strength (almost double that of mild steel), it is possible to use thinner gauge tubing when building a product which provides for less weight, or a product that is the same weight but nearly twice as strong.
The Saffer chrome-moly swing arm improved handling without adding weight to the bike or requiring frame bracing. The advantage in using chrome-moly is the "twice as strong" property of the material.
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