The 58 isn't to give him a bigger gear than a 53 or 55 would. Think its so he can use the middle of the cassette instead of the 11t sprocket and therefore run a better chainline.
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The 58 isn't to give him a bigger gear than a 53 or 55 would. Think its so he can use the middle of the cassette instead of the 11t sprocket and therefore run a better chainline.