Made of aluminum alloy, CNC machined process and anodic oxidation electroplating, with the trait of smooth surface, bright color, not faded and corrosion resistance.<br> Elliptical Design: Eliminate trampling dead point, enlarge force distance for the best starting point, solve chain skipping problem, save more effort and increase speed, without any hindrance or noise.<br> Knee protection: The chain ring can distribute trampling power more reasonably so that protect knee meniscus more effectively and reduce knee wear during climbing race and long-distance riding.<br> Speed: 52T 53T<br> BCD: 130mm<br> Specification:<br> Diameter: 225mm<br> Package Includes:<br> 1 Piece Bike Chainring<br> Note:<br> 1.Color might be slightly different due to the color calibration of each individual monitor.<br> 2.Please allow the tiny measuring deviation 1-2mm due to manual measurement.<br> 3.Thanks for your understanding and enjoy your shopping moment!<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store