21819 X4 Blk
New SRAM X4 7/8 Speed Rear Derailler 1:1 Actuation Ratio 6061 Alloy B-knuckle
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The X.4 line-up sets the standard for recreational level shifting. An intelligent blend of performance and value for MTB or pavement.
Features
1:1 Actuation Ratio
Di.R.T: Direct Route Technology
Lightweight materials selection
6061 Alloy B-knuckle
Steel cage with replaceable pulleys
Speeds - 7/8
Long Cage
Capacity: Long 45T
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