Bikes like these usually come with stabiliser wheels to help with balance, coaster brakes (which work when pedalling backwards) and/or independent front & rear hand operated bar brakes (depending on brand). 1  Dawes Thunder 12 Inch 2017 Kids Bike Â£99.99. Quick view. 2  Dawes Lil Duchess 12 2017 Kids Bike Â£119.99. Quick view.