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Denver's Civic Center park became the central hub for Bike to Work Day June 28, 2017 in Denver.

UnitedHealthcare employees Heberto Limas-Villers, left, and David Sund, right, assemble a bicycle at the Denver Bike to Work Day at Civic Center Park June 28, 2017 in Denver. UnitedHealthcare partnered with the local non-profit Wish for Wheels and built 25 bicycles to be donated to Rocky Mountain Prep students at the start of of the 2017-18 school year.

Necessary tools to assemble bicycles by UnitedHealthcare and folks at Wish for Wheels at the Denver Bike to Work Day at Civic Center Park June 28, 2017 in Denver. UnitedHealthcare partnered with the local non-profit Wish for Wheels and built 25 bicycles to be donated to Rocky Mountain Prep students at the start of of the 2017-18 school year.

UnitedHealthcare employees David Sound, left, Heberto Limas-Villers, center, and Mike Parker, right, assemble a bicycle at the Denver Bike to Work Day at Civic Center Park June 28, 2017 in Denver. UnitedHealthcare partnered with the local non-profit Wish for Wheels and built 25 bicycles to be donated to Rocky Mountain Prep students at the start of of the 2017-18 school year.

Bicycles assembled by UnitedHealthcare and Wish for Wheels folks at the Denver Bike to Work Day at Civic Center Park June 28, 2017 in Denver. UnitedHealthcare partnered with the local non-profit Wish for Wheels and built 25 bicycles to be donated to Rocky Mountain Prep students at the start of of the 2017-18 school year.

A cyclist heads down Bannock St. on Bike to Work Day June 28, 2017 in Denver.

Cyclists cross 14th Avenue at Bannock Street in Denver on Bike to Work Day, June 28.

A cyclist prepares gathers his gear at a bike rack in Civic Center park to head out on Bike to Work Day June 28, 2017 in Denver.