How spec sheets write it
The most common ways bicycle spec sheets name it, by number of mentions.
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Shimano Zee
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Shimano Zee, 10-speed
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Shimano Zee M640 10-Speed
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Shimano SL-M640, Zee, 10 Speed with STEPS SC-E5000 Display
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Shimano Zee 10-Speed
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Shimano Zee Shadow Plus short cage
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Shimano SL-M640, 10
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Shimano Zee 10 speed
Bicycles
Published bicycles that use it, newest model years first.