DuraAce gives performance cyclists an advantage by reducing bicycleinduced stresses during competition. Incorporating highly refined mechanical systems and lowmass construction that reduces weight without sacrificing strength, DuraAce delivers the control response and dependability that racers demand. Shimano DA CS7700 11t with builtin spacer features a 1.76mm cog thickness. Shimano DuraAce 9speed individual cogs and clusters, features a1.76mm cog thickness. DuraAce CS7700 9spe
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