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| Derailleur |
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A mechanism that moves the bicycle chain from one gear sprocket to another when the gear is shifted.
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| Disk Wheel |
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A solid wheel, without spokes, that's used in the time trial and sometimes in other races because of its aerodynamic qualities.
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| Domestique |
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The team rider in a long race who's responsible for getting food, water, and other from the support vehicle and distributing them to his teammates.
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| Draft |
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To ride close behind another racer in order to take advantage of decreased wind resistance.
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| Drops |
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The lower portion of down-turned handlebars.
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