The specialists at CycloWorld have created an index that is ideally suited for comparing the severity of bike rides. CWiX 500 : the list of the most difficult gran fondos CWiX 250 : the list of the most difficult sportives Gravel 500 : the list of the toughest gravel gran fondos Gravel 250 : the list of the toughest gravel sportives XCM 500: The toughest MTB marathons XC 250 : The toughest MTB sportives
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