SRAM eagle drivetrains are the only 1x drivetrains that are fully system engineered for optimal performance. Eagle drivetrains are designed, tested and proven to deliver the lightest, highest-performing, most durable systems for all riders on any trail. Eagle technology provides an expanded, optimum, gear range that allows you to realize your bike's potential beyond where it has ever been. Every SRAM GX eagle component is 100-percent compatible with all levels of SRAM eagle drive train systems. This is eagle. Included: SRAM rear derailleur GX eagle 12 speed SRAM shifter GX eagle trigger 12 speed rear w discrete clamp SRAM cassette xg-1275 eagle 10-50 12 speed SRAM chain PC GX eagle 126 links power lock flow link 12 speed SRAM crank GX eagle dub 170 mm or 175mm SRAM 32T X-SYNC direct mount chainring chaingap gauge