I rode with red, yellow and blue studs. Of all the spikes, the yellow ones are best for your knees, and your body will thank you after long rides! Of course, you won't be as effective as using 100% of your power, but be realistic. Do you really think you release numbers like Sagan? I would not recommend any other colors unless you are wearing a professional uniform as the risk of doing real damage to your joints is too great.
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