In 2012, SRAM 'turned it up to eleven' and the MTB world changed, now they have gone a step further with the brand new Eagle XG-1299 12 Speed Cassette Gold. Offering a greater range of gears at the back for serious hill climbing a a bigger choice at the front for trail riders and racers alike, SRAM Eagle takes shifting to another level once again. The new XX1 Eagle Cassette is both lighter, more durable and stronger than anything that has come before. With a massive 10-50 tooth range and 500% gearing ratio, nothing matches the performance of the Eagle Cassette. Pick up a new Eagle XG-1299 12 Speed Cassette Goldas part of your upgrade to Eagle.
Moving to twelve speed means a change of shifter, chain, cassette and crankset. Luckily, Biketart has the full range of X01 and XX1 Eagle, right here. This first look from Bike Radar helps you to compare the advantages of 12 speed over 11 speed.
Features:

Greatest durability and lightest weight on market
Smoother, quieter system with enhanced inboard and outboard shift performance
XD driver body compatible
10, 12, 14, 16, 18, 21, 24, 28, 32, 36, 42, 50