Great Britain's Alex Dowsett was unable to break the men's hour record for a second time in Mexico.
The 33-year-old previously held the record with a distance of 52.937 km - set in 2015 - before attempting to break Victor Campenaerts's feat of 55.089 km, which has stood for two and a half years.
Dowsett failed in his attempt to do so, though - ending with 54.555 km - but the Brit affirmed that the bigger picture of raising money for the Little Bleeders and The Haemophilia Society was the day's success story.
"There were three targets coming into this, the first was to break the record," Dowsett said in quotes attributed to BBC Sport. "I want to take the opportunity to say another well done to Victor and to Dan [Bigham, British record holder] because there was a British and a world record up for grabs today and I was a bit shy with both of them.
"But today was a success because the other two targets were to see how far I can go and 54.555 is as far as I can go.
"We chucked everything at this. Both Chanel [his partner] and the small team around us, who've done a lot of work to get to here. I'm proud of the distance I managed to cover today.
"The last target today was the awareness we've brought to haemophilia and to rare diseases, and the message we've sent out before the start gun went today.
"The overriding message for anyone with haemophilia, or anyone with a rare condition or facing adversity, is to just give it a shot, because the biggest failure today would have been to not be here."
Dowsett - who suffers from severe haemophilia A - previously held his 2015 record for 35 days before being dethroned by Sir Bradley Wiggins.
