Ace enters a mountain bike race in this fast-paced, STEM-themed early reader! Ace polishes up her mountain bike and prepares for the big bike race! She oils the chain and tests the brakes. Then the race begins! But Ace's bike chain comes off the sprocket and then she needs to patch a tire! Will she be able to fix her bike in time and find her way to the finish line? With Larry Dane Brimner's simple text and Kaylani Juanita's full-color artwork on every page, this fast-paced, action-packed book is perfect for new readers!