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DT ®

From WikiPedalia

Swiss DT is the leading manufacturer of spokes. When DT spokes first became available in the U.S. market in the late 1970's, they revolutionized wheel building. Although stainless spokes had been available previously, the quality of the threading on DT spokes and nipples was quite a lot better than that of brands that had previously been available, allowing wheels to be built at considerably higher spoke tensions than had previously been possible.

"DT" stands for "Drahtwerke Tréfilerie." "Drahtwerke" means "wire works" in German; Tréfilerie means the same thing in French.