In Yosemite Valley, bike rentals are available during the warmer months of the year. There are small bikes and trailers for children, and tandem and hand crank bikes for the visually or physically impaired. With more than 12 miles of paved, mostly flat trails, riding a bicycle is a fun, easy way to see Yosemite Valley. The 12-mile loop usually takes an average of 2 hours to complete.