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Sometimes you've got a really really nice stem and a really really nice handlebar, but they aren't the same diameter! This is an elegant solution to matching the two, for use with older 25.4mm or 26.0mm handlebars on modern 31.8mm stems.
The HS-4 25.4-31.8mm version is 48mm wide, while the HS-5 26.0-31.8mm version is 44mm wide.
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