are precision machined from aircraft quality 7075-T6 Aluminum ( 83% stronger than 6061) and available in Stealth Black, offering the highest performance at the right price. Rennen is the first to introduce Integrated Chainring bolt nuts. With our newest Chainring inovation you will never have to use a chainring wrench again. We have machined into the gears the internal Threads increasing accuracy and eliminating the frustration. Only Rennen offer a single speed specific tooth profile which have been designed to extend tooth life. At 65 grams (42T) this makes Rennen 110mm Chainrings one of the lightest on the market.