It has literally 556 km. I installed it new on a Spark that I bought, but at 52 years old, it is not my type of bike and I am switching to something more relaxed. Beam Spider construction, which allows for great weight savings while promising long durability. Not only the spider, but also the three largest sprockets are made of aluminum. The highlight, however, is the 5 central titanium sprockets. The incredibly light cassette also features Hyperglide+ technology, which ensures high shifting speed, precision, and smoothness when shifting up and down. - Compatible with 12-speed systems....