In according the amount of teeth on the chainrings says allot about the cyclist! Climbers, sprinters and mountain bikers use different chainrings in according to the type of event and terrain that has been offered and it's not uncommon to replace them with better performing products over the first assembly, focusing on oval "Rotor" chainrings or the traditional round ones. The different mounting standards (BCD, ABS, 4H, BB30, GXP, Direct Mount..) require some care in choosing the chainrings and a few spare parts and little knowledge to use and replace, allowing you to customize its transmission according to the desire of the moment, giving you the opportunity to express the full potential in competition and in training.