Variants
The manufacturer's versions of this model (code suffix, color, cage). Each figure counts spec sheets that name that exact version; most name only the model.
How spec sheets write it
The most common ways bicycle spec sheets name it, by number of mentions.
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Shimano Dura-Ace 7970 Di2 STI
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Shimano Dura-Ace 7970 Di2 STI, 20 speed
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Shimano Dura-Ace Di2 7970
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Shimano ST-7970 Dura Ace