EKAR 13 speed cassettes are optimized for 3 different riding options including endurance, gravel race and gravel adventure Ranges and steps designed specifically with the ability to perform on and off the beaten path 9-36t13sp9,10,11,12,13,14,16,18,20,23,27,31,36SilverEKAR CS21UPC/EAN/GTIN: 8053340455452