Cassette 8g PG-850/830

Compatible with Shimano and Sram.
Cassettes from Sram are available in several qualities and the more expensive you choose a cassette the longer it lasts, make sure you choose a chain of a similar quality otherwise this theory does not hold.
Assembly:
The cassette is placed over your rear hub and secured with a locking ring at the end which is tightened with a key (puller) that has 12 pins.
The locking ring comes with this item
Guide to changing the cassette
PG-830 is:
11-28
11-30
11-32
PG-850 is:
12-23
12-26