How spec sheets write it
The most common ways bicycle spec sheets name it, by number of mentions.
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Hayes Dominion A4
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Hayes mechanical disc brake
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Hayes Dominion A4, Post Mount, Four Piston Caliper
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Hayes 200mm
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Hayes CX Expert
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Hayes D-Series, 203mm Front, 180mm Rear, 6 Bolt Hub Fitment
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Hayes L-Series 160mm
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Hayes CX Comp