Shimano Deore XT Shadow Long Cage Rear Derailleur RD-M772: M772 'Shadow': lower profile body with direct cable routing, stronger spring, and redesigned bracket to avoid chainstay contact. Designed for 11-32t & 11-34t cassettes only. Aluminum B-attachment with a Top-Normal return spring. Wide link parallelogram design increases rigidity and performance. 4 fluoric coated link pivot bushings minimize friction. Aluminum construction with 11-tooth pulleys (sealed bearing tension).