The UCI, with assistance of Italian police, conducted a surprise check on 36 bikes after the finish of Milan-San Remo, suspicious that some riders and teams may have used hidden motors during the race. Nothing was reported found during the checks, however, and all the bikes were eventually given back to the teams.

Cyclingnews reported that 11 Trek bikes from the Trek Factory Racing team, 11 Specialized bikes from Etixx-Quick Step and 11 Specialized bikes from Tinkoff-Saxo were checked by the UCI in a special tent in the bus parking area. The bikes of the three podium finishers: John Degenkolb (Giant), Alexander Kristoff (Canyon) and Michael Matthews (Scott) were also checked in the podium area. Gazzetta dello Sport reported that bikes from the Astana tream were also tested, but the team has told Cyclingnews that their bikes in fact were not.

In the past the UCI has carried out surprise checks for so-called ‘mechanical doping’ using a scanner, and ultimately introduced specific rules that allow for checks. The suspicion of small motors being hidden in the seat tube of bikes first emerged in 2010, sparking a series of headlines and firm denials from those accused. However, despite the occasional check at races and accusations based on video evidence, no motors have ever actually been discovered to this day.

The UCI reportedly checked two bikes from six different teams at Paris-Nice, but the checks done after Milan-San Remo seemed more serious and less random, as if certain teams and riders were specifically targeted. According to Gazzetta dello Sport,six police officers and an investigating magistrate were also present to investigate possible sporting fraud, which is a crime in Italy.

The UCI announced the surprise bike checks via race radio just 20km from the finish of Milan-San Remo, as riders were preparing to attack the Poggio. Some riders were apparently stopped just after the finish, where their bikes were tagged and then quickly taken from riders and mechanics as they reached team buses parked 300 meters away from the finish. As part of the process, head mechanics from the teams were identified and signed documents stating that the tests had been accomplished correctly. Some teams had to remove seat posts and bottom brackets so that the UCI inspectors could use small video cameras to see inside the frames.

The UCI eventually issued a brief statement to Cyclingnews on Monday confirming that it "carried out unannounced bike checks at Milano-San Remo" and that it "has planned to do so on other races throughout the international calendar."