Skinny tires are used on UCI time trial bikes for one reason, aerodynamics. The large diameter front wheel is the farthest forward part of the bike and reducing the width of the tire cuts down the overall frontal area a significant amount. When fairings are illegal, cutting down on frontal area is the main way to go faster. The type of time trial bikes which set records are doing it on smooth velodromes so there is no reason to use a wider tire for handling or safety reasons. Some track tubulars are so thin they are only used for a few rides.
Operating costs are no object for an hour record attempt time trial bike.
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