International Cycling Union (UCI) president Pat McQuaid said he had some sympathy for Froome.
Team Sky pay tribute to Chris Froome
"It probably is the worst Tour to win because it comes after the whole Armstrong affair, but I think for Chris Froome it is going to be the best one as it is the 100th edition of the race," McQuaid told BBC Sport.
Asked if cycling was now free from doping, McQuaid responded: "You can never be 100% confident. I don't see the biological passports or profiles, but I would be confident that Chris Froome is clean."
Froome said he understood why some people still distrusted cycling, but insisted the scepticism had not marred his victory.
"I wouldn't say the cheats spoilt the moment," he said. "I've still absolutely enjoyed it and every second has been worth it even though we've come under the microscope."
He added: "I think some people will never believe. We just have to accept that because they've been betrayed in the past. But I believe. I know what I'm doing and I know what my team-mates are doing."
He believes the road race's unusually hilly course may suit him.
"It's an event that doesn't often favour climbers the way it does this year," the Kenya-born rider said. "It's a great opportunity to go for it.
"My focus has just been on the Tour up until now but being world champion, that's probably the second biggest thing after wearing the yellow jersey."
Only five men have won the Tour de France and World Championship road race in the same year - American Greg LeMond was the last to do it in 1989 - and only two Britons - Tom Simpson in 1965 and Mark Cavendish
- have ever become world road race champion.
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