Check that the handlebar is securely fastened and that it moves smoothly. Check that the wheels can spin smoothly and each part is securely fixed. Finally after checking the above points, you can now start to ride. 2. 4. WWW.YBIKE.CO.ZA ENJOY YOUR YBIKE EXTREME 2.0! WARNING! This product must be assembled by an adult. Read the manufacturer’s instructions before using. Keep the instructions safe for future reference. 3. Check that all the bolts are tightened. 1.