Michael Aisner, the former race director of the Coors Classic bike race, has been accused by prosecutors of listing his north Boulder home on a couch-surfing app and then secretly taping male guests while they were showering.

Aisner, 70, is charged with invasion of privacy for sexual gratification, attempted invasion of privacy for sexual gratification, and tampering with physical evidence.

The invasion of privacy charges are misdemeanors, while the tampering charge is a Class 6 felony.

According to an arrest affidavit, a man went to the Boulder County Sheriff’s Office in June after he went on a couch-surfing app and found Aisner’s address on North Cedar Brook Road just northwest of Boulder.

The man told police one day Aisner encouraged him to use Aisner’s personal shower. While the man was preparing to take a shower, he noticed what appeared to be a “semi-hidden” mini spy camera pointed at the shower.

The man took a picture of the device and gave it to police, who found out it was a Tangmi Mini Spy Camera.

Detectives applied for a warrant at the address and seized the camera and Aisner’s computer, and forensic specialists were able to recover more than 100 video files, seven of which depicted males naked from the waist down entering the shower.

There were also six videos in which the camera failed to activate quickly enough to capture the men undressing or getting into the shower, and the video only shows them in the shower with the curtain closed.

In addition to those videos, the affidavit states there were dozens of other clips of Aisner placing the camera in the shower and then removing it after the guests were done showering. Another video captures Aisner asking someone how to delete and overwrite files from the camera.

Aisner told the sheriff’s office that the camera was never on in the bathroom and that he did not have any videos of people showering on the computer.

“Based on those statements and his attempt to delete the videos from the SD card, Michael was obviously being deceitful in his statements to avoid any criminal charges,” a detective wrote in the arrest affidavit. The detective also noted that pornography found in Aisner’s bedroom indicated the videos were “used for sexual gratification.”

Aisner is scheduled for an arraignment on Nov. 15 and is free on $2,500 bond, according to court records.

Aisner is probably best known for his role as race director of the Coors International Bicycle Classic, which at its height in the ’80s was one of the biggest stage races in the world.

The race was founded in 1975 by Celestial Seasonings tea company founders Mo Siegel and John and Wyck Hay and initially named the Red Zinger Bicycle Classic. In 1979, Aisner, then the race promoter, bought the event for $1 and took over the race and enlisted Coors Brewing Co. as the sponsor.

At its longest, the race lasted 16 days and started as far west as Hawaii but typically ended in North Boulder Park, where a monument to the race was recently erected.

Winners of the event included three-time Tour de France winner Greg LeMond, national champion Dale Stetina, and Olympic medalist, national champion and two-time Tour de France stage winner Davis Phinney.