These areThe new SLX front derailleurs specifically for use withThe "all mountain compact drive" SLXTwo-chainring crank. (if youre using aTraditionalTriple crank, you wantThe 660/661 series SLX part). new compact cage design offers increased clearance on suspension swingarms Specially matched radiusTo handle MTB double cranks Wider chainstay angle works better onTodays long-travel, full suspension bikes claimed 163 grams
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