James has organised a bike class at the Big Hub for the younger children to learn to cycle safely. Meanwhile, Bob has thought of a brilliant way to market his spuds – a potato pyramid!\n\nAs everyone gets ready, Caitlin is too proud to admit that she can't ride a bike. She comes up with a string of excuses for why she can't take part. Molly inadvertently makes things worse, lending Caitlin a bike and a big hooter. Euan tries to persuade Caitlin to own up to James, but she won't listen.\n\nBy the time Moira realises what's happening, Caitlin is about to take her turn at bike class. Can Molly come to the rescue? And will Bob's potato pyramid survive?