See photos from the second annual core4 race in Johnson County.

Riders descend a gravel road shortly after the start during the second annual core4 cycling race in Johnson County, Iowa on Saturday, August 19, 2023. The race, modeled after the Rule of Three race in Bentonville, Arkansas, is named for the road surfaces that make up its over 100-mile route: gravel roads, single-track trails, level b roads, and pavement. (Nick Rohlman/The Gazette)

Joshua Kappelman rides through a corner in the Sugar Bottom single-track section during the second annual core4 cycling race in Johnson County, Iowa on Saturday, August 19, 2023. The race, modeled after the Rule of Three race in Bentonville, Arkansas, is named for the road surfaces that make up its over 100-mile route: gravel roads, single-track trails, level b roads, and pavement. (Nick Rohlman/The Gazette)

The lead group makes their way along a gravel road during the second annual core4 cycling race in Johnson County, Iowa on Saturday, August 19, 2023. The race, modeled after the Rule of Three race in Bentonville, Arkansas, is named for the road surfaces that make up its over 100-mile route: gravel roads, single-track trails, level b roads, and pavement. (Nick Rohlman/The Gazette)

Wade Johnson climbs level-b-road during the second annual core4 cycling race in Johnson County, Iowa on Saturday, August 19, 2023. The race, modeled after the Rule of Three race in Bentonville, Arkansas, is named for the road surfaces that make up its over 100-mile route: gravel roads, single-track trails, level b roads, and pavement. (Nick Rohlman/The Gazette)

A rider navigates the course during the second annual core4 cycling race in Johnson County, Iowa on Saturday, August 19, 2023. The race, modeled after the Rule of Three race in Bentonville, Arkansas, is named for the road surfaces that make up its over 100-mile route: gravel roads, single-track trails, level b roads, and pavement. (Nick Rohlman/The Gazette)

Riders make their way across the Coralville Dam during the second annual core4 cycling race in Johnson County, Iowa on Saturday, August 19, 2023. The race, modeled after the Rule of Three race in Bentonville, Arkansas, is named for the road surfaces that make up its over 100-mile route: gravel roads, single-track trails, level b roads, and pavement. (Nick Rohlman/The Gazette)

Goldfinch Cyclery employee Lillian Prop hoses down riders at an aid station during the second annual core4 cycling race in Johnson County, Iowa on Saturday, August 19, 2023. The race, modeled after the Rule of Three race in Bentonville, Arkansas, is named for the road surfaces that make up its over 100-mile route: gravel roads, single-track trails, level b roads, and pavement. (Nick Rohlman/The Gazette)

Riders make their way along a gravel road during the second annual core4 cycling race in Johnson County, Iowa on Saturday, August 19, 2023. The race, modeled after the Rule of Three race in Bentonville, Arkansas, is named for the road surfaces that make up its over 100-mile route: gravel roads, single-track trails, level b roads, and pavement. (Nick Rohlman/The Gazette)

Riders make their way up a level-b road during the second annual core4 cycling race in Johnson County, Iowa on Saturday, August 19, 2023. The race, modeled after the Rule of Three race in Bentonville, Arkansas, is named for the road surfaces that make up its over 100-mile route: gravel roads, single-track trails, level b roads, and pavement. (Nick Rohlman/The Gazette)

Spencer Whittier (right) and Benjamin Eugene Anderson (left) make their way through a single-track section during the second annual core4 cycling race in Johnson County, Iowa on Saturday, August 19, 2023. The race, modeled after the Rule of Three race in Bentonville, Arkansas, is named for the road surfaces that make up its over 100-mile route: gravel roads, single-track trails, level b roads, and pavement. (Nick Rohlman/The Gazette)

Men’s 100-mile winner Nate Kullbom makes his way up a cyclocross-style climb to the finish line during the second annual core4 cycling race in Johnson County, Iowa on Saturday, August 19, 2023. The race, modeled after the Rule of Three race in Bentonville, Arkansas, is named for the road surfaces that make up its over 100-mile route: gravel roads, single-track trails, level b roads, and pavement. (Nick Rohlman/The Gazette)

Women’s 100-mile winner Vanessa Curtis crosses the finish line during the second annual core4 cycling race in Johnson County, Iowa on Saturday, August 19, 2023. The race, modeled after the Rule of Three race in Bentonville, Arkansas, is named for the road surfaces that make up its over 100-mile route: gravel roads, single-track trails, level b roads, and pavement. (Nick Rohlman/The Gazette)

Alex Buhmeyer gives instructions to riders before the second annual core4 cycling race in Johnson County, Iowa on Saturday, August 19, 2023. The race, modeled after the Rule of Three race in Bentonville, Arkansas, is named for the road surfaces that make up its over 100-mile route: gravel roads, single-track trails, level b roads, and pavement. (Nick Rohlman/The Gazette)

Riders navigate the course during the second annual core4 cycling race in Johnson County, Iowa on Saturday, August 19, 2023. The race, modeled after the Rule of Three race in Bentonville, Arkansas, is named for the road surfaces that make up its over 100-mile route: gravel roads, single-track trails, level b roads, and pavement. (Nick Rohlman/The Gazette)

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