Answer by taking a quote from the following article:

Gregory James "Greg" LeMond (born June 26, 1961) is an American former professional road racing cyclist who won the Road Race World Championship twice (1983 and 1989) and the Tour de France three times (1986, 1989 and 1990). He is also an entrepreneur and anti-doping advocate. LeMond was born in Lakewood, California, and raised in ranch country on the eastern slopes of the Sierra Nevada mountain range, near Reno. He is married and has three children with his wife Kathy, with whom he supports a variety of charitable causes and organizations.

LeMond is a longtime vocal opponent of performance-enhancing drug use. He first spoke on-record against doping in cycling after winning the 1989 Tour de France. LeMond received intense criticism in 2001 when he publicly expressed doubts about the legitimacy of Lance Armstrong's Tour success after learning of his relationship with Dr. Michele Ferrari. His outspokenness placed him in the center of the anti-doping controversy.  LeMond has consistently questioned the relationship between riders and unethical sports doctors like Ferrari, and has pointed out that doping products ultimately victimize the professional cyclists who make use of them. Said LeMond: "When I speak out about doping people could translate it and think it was about the riders. Actually I feel like I am an advocate for the riders. I look at them as being treated like lab rats that are test vehicles for the doctors. The doctors, the management, the officials, they're the ones that have corrupted riders. The riders are the only ones that pay the price."  LeMond's most notable conflicts have been with fellow Tour riders Lance Armstrong and Floyd Landis. He has also been critical of Alberto Contador, the UCI, and its former president, Pat McQuaid. In December 2012, LeMond claimed that a change needed to be made at the head of leadership for the UCI, and stated if called upon he would be willing to take the position himself if necessary to lead cycling out of the mire of doping. Said LeMond: "It is now or never to act. After the earthquake caused by the Armstrong case another chance will not arise. I am willing to invest to make this institution more democratic, transparent and look for the best candidate in the longer term."  McQuaid rejected LeMond's call for new leadership and was dismissive of LeMond. Ultimately McQuaid was defeated in his bid for a third term by British Cycling president Brian Cookson at the September 2013 UCI Congress in Florence, Italy. Lemond had supported Cookson in the UCI Presidential battle.

Why did he feel a change was needed?
to lead cycling out of the mire of doping. Said LeMond: "It is now or never to act.