Bob is designing two new bicycles. The bikes are identical except for the wheels. Bike 1 has solid wheels, mass M, radius R. Bike 2 has "hoop" wheels. The hoop wheels have the same mass, but that mass is situated as far as possible from the center. Bob has decided to take each bicycle for a test ride. Assume Bob exerts the same effort to get each bicycle moving. Which bicycle will take longer to build up speed? Briefly explain/justify your answer with appropriate physics concepts.