The Old Bike is the first Chibi-Ride you unlock. It is found by walking up to the broken bridge, where Chibi-Robo will look across the water to see the bike. The sattelite dish will come out of Chibi-Robo's head and Chet will inform you that to get to it, you need to fix the bridge. After that, Chet will talk about unlocking Park Projects. You must fix the Bridge in order to obtain the Old Bike. After a while of riding the bike, it will collapse and Chet will talk about "how he knew it would happen". After this, the New Bike should be available in the Chibi-Gear Shop.