Maintaining a fixed gear is relatively easy because it has fewer parts than a geared bicycle. The sprocket should be checked regularly to make sure there is no damage to any teeth and that no object is grinding it as it turns with the rear wheel. The chainring should be checked similarly for any damage. There is an advantage to selecting a number of chainring teeth that is not a round multiple of the number of sprocket teeth (e.g. 3) because this avoids coincidence of the same chainring and sprocket teeth, and tyre contact patch, on each of the rider's power strokes. For riders who perform brakeless skid-stops, it is best to select prime-numbered chainrings (e.g. 41, 43 or 47 teeth) to guarantee that rear tyre wear is spread evenly.