I personally haven't found much difference in flats between varying weights, but the lightweight ones fold up smaller to fit in my seat bag.
Originally Posted by
ciocc_cat
If you're really worried about inertia/rolling resistance, ride sew-ups (tubulars).
http://ddata.over-blog.com/xxxyyy/0/...lar-specs.html
http://ddata.over-blog.com/xxxyyy/0/...her-specs.html
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