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 ST-EF51
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Shimano EF51
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Shimano EF-51
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Shimano Altus EF51, 8 speed
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Shimano EF51, 2-finger brake/shifter combo
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Shimano Altus EF51, 7 speed
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Shimano EF51, 7-speed trigger
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Shimano EF51, EZ Fire, 8-speed
Bicycles
Published bicycles that use it, newest model years first.
