Iowa City, IAAugust 17, 2024 core4 Westside Training Ride Reg! Register for core4 2024 Here! 2023 Race Results Picture yourself at core4 2024. 2023 Photo Booth + Podium Gallery core4 is Iowa City’s premier cycling experience: a celebration of community, opportunity, recreation, and engagement. the courses route through champagne gravel, the best b roads, amazing urban experiences, and super fast singletrack.