20w wouldn't be an unusual increase depending on how well trained you are. When did you last test?
To be honest, I rarely do nowadays. My FTP stays close to 300-320 and I can tell where I should set it based on HR and feel on longer threshold efforts. I’ll test if I’ve been off the bike for a bit, or at the end of a decent block of training.
@TTM started
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20w wouldn't be an unusual increase depending on how well trained you are. When did you last test?