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Shimano XTR M980 Rear Derailleur
It doesn't matter how your derailleur does what it does, as long as it keeps doing it when the trail conditions get nasty. For 2011, Shimano has designed a rear derailleur to do exactly that -- no sick days, weather delays, "wardrobe malfunctions" or hiccups -- it does what it does, period. The reengineered architecture on this Shimano rear derailleur gives you a smooth, linear feel at the shifter, and remains stable in the midst of suspension movement, trail chatter or the ever-present dirt factor. If you need a rear derailleur that doesn't make excuses, you need the new XTR.
10-speed Dyna-Sys technology
Advanced Light Action gives you a smooth, linear feel at the shift lever
Carbon outer plate, sealed bearing pulleys
Shimano Shadow RD design keeps a low-profile, out of reach of trailside debris, rock gardens and other hazards
Optimized for 42/32/24T gear combinations; shorter cage reduces chain bounce and improves ground clearance
Capacity: 35T (GS); 41T (SGS)
Max front difference: 18T
Max cog: 36T
Min cog: 11T
Wt.: 175g (GS); 177g (SGS)
Compatible with Shimano 10-Speed Dyna-sys Drivetrains Only