A lot, especially on the first 35 carbon ones. From personal experience, the RF SixC & Next (unless they're the narrow SL ones) are super stiff. As are the Renthal 35s. Even Renthal 31.8 carbon is stiff AF - I did 1 ride with those and took them off. Newer 35s (in last couple years since OneUp came out) have actually been trying to get back to feeling like 31.8.
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