Shimano Dura-Ace R9100 55t 110mm Chainring for 55-42t. This Shimano chainring allows you to update your Dura-Ace FC-R9100 11-speed crankset with a chainring configuration to best fit your riding style.

Integrates Shimano Hollowglide Technology: the high rigidity hollow structure cuts down on weight yet maintains strength to provide better power transfer and quicker more precise front shifting

Features a weight saving 4-bolt design with a BCD of 110 mm