I changed to slicks on my Specialized Hardrock Comp because most of my commuting is roads and paved trails. Realized a while back I do not get off the road like I originally thought I would so I changed the tires. What a difference. Would that mess up the odometer distance?

I have been averaging 17-18 mph since the change. This morning was a beautiful sunny breezy commute. I took it very easy and still managed 17.3 mph. I have decided I am going to jump in a bike race before the year is over. Any suggestions from any Chicagolanders?