Old 03-02-19, 10:22 PM
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First, it matters how much torque you produce.

Letís say the 90ís are stiffer than the 70ís, if you arenít strong enough to flex the 70ís, then having a stiffer sole wonít matter.

Also, the difference could be in weight savings, not stiffness. And the 90ís being so light that they are less stiff. Like the difference between cromoly and carbon saddle rails or handle bars.
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