Tour de France Tour de France 2023, stage 21: Saint-Quentin-en-Yvelines - Paris, 115.1k

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You mean, riders would be out of the competition after their first three GT appearances, even if they're still young enough? Would riders who started, but didn't finish, also be out of it?
I think that would be fair. Unless a team is really stuck, most guys that age are only doing one GT a year anyway so it's likely only going to stop the top level talent from competing multiple years (Pog, Remco, Rodriguez etc would all drop out earlier than usual)