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Key events can be any memorable event, for example an impressive victory but also a major crash, bold solo or anything that makes for sporting memories.
In the TTT of the 2017 Tirreno-Adriatico, Sky rider Gianni Moscon's front tri-spoke wheel collapsed, causing the Italian to crash. Moscon said afterwards that the collapse happened after he hit a hole in the road.
After the team's wheel sponsor, PRO, had finished its investigations, they had concluded that the crash was caused by mechanics not fitting the wheels with wide enough tyres.