Fibre-Lyte carbon fiber chainrings are available as a single ring for time trial racing for which they can last thousands of miles if well-maintained. They are also available as a double ring with lift pins and reduced profile teeth for smooth shifting. However, customers must ensure that if using the chainrings on a double setup, that they purchase the correct type of chainring, as using a chainring machined for a single on a double can damage the chainring. Please contact us for advice. All rings are custom made, any number of teeth on any BCD, as well as choice of weave style.