RCS Sport, organisers of the Giro d'Italia, are asking for Filippo Ganna (26) to find another date for his attempt at the Hour record as it is scheduled for the same day as their flagship one-day race, the Giro di Lombardia.
Italian Ganna's Ineos Grenadiers team said on Friday that the time-trial world champion would make his bid for the record on October 8th in Grenchen, Switzerland.
"RCS Sport considers this concomitance inappropriate," RCS Sport told Reuters on Saturday.
"Two events of international level and of great importance for professional cycling should not take place on the same date," it added, referring to the October 8th clash.
"RCS Sport hopes that an optimal solution can soon be found to allow fans and professionals to follow both these wonderful challenges."
The Giro di Lombardia is the last of five "Monument" classics after Milan-Sanremo, the Tour of Flanders, Paris-Roubaix and Liege-Bastogne-Liege.