I'm 5'7" and I ride a 54cm - that's with a horizontal top tube, so I'd say you need bigger but with a compact design you can get away with the smaller seat tube - effective top tube length is more important.
@yoav started
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I'm 5'7" and I ride a 54cm - that's with a horizontal top tube, so I'd say you need bigger but with a compact design you can get away with the smaller seat tube - effective top tube length is more important.