Bike Mudguards will protect your bike from splashing water and dirt flying from under the wheels. Usually included in the standard kit when buying a road bike, as well as bundled with some mountain and hybrid models. If wings are not provided with the bike, they are purchased separately. Before buying, you need to know the diameter of the wheel. It can be found on the side of the tire. You should also pay attention to the width of the tire, especially if you have a mountain bike.