I agree with the others on fitness. Any time I start cramping from a ride it is due to fitness. Not necessarily FTP, but long ride muscular endurance. My average rides are 20-30 miles. The first time I do 50-100 miles I am going to cramp. Getting in a couple of 100-mile rides at a decent pace usually gets me past the cramping issue. That first one really hurts, the second isn’t too bad, but by the third one I don’t experience any cramping.
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